when you are saying “only a part of it”
which “parts” in particular do not work…
(admin? frontend? some global text strings ? or particular plugins/themes only ?)

forget that question. i watched the video you linked to and figured it out from there what the versions are
i’ll see what happens when i do this locally here first of all and will get back to you when i know more

the last one left is using a filter then .
so something like this (i assume you know how wordpress filters work and how/where to use them)

/*
remove first <td> (label) from customer data in emails and/or print templates
*/
add_filter('wppizza_filter_template_customer_section', 'myprefix_remove_customer_labels', 10, 3);
function myprefix_remove_customer_labels($markup_array, $template_type, $tplId){
/*
only filter for print templates
else return as is
*/	
if($template_type != 'print'){
return $markup_array;	
}
/*
//	if required one could also restrict by template id like
//	if($tplId != 3){return $markup_array;}
*/
/* 
quick remove colspan from thead, as we are removing all label td's to end up with one td only per tr 
*/
$markup_array['section_label'] = str_replace('colspan="2"', '' , $markup_array['section_label']);
/*
all customer data fields - by array keys -  where we want to remove the label td
intersecting the 2 we want to keep, with the rest
*/
$customer_data_keys = array_diff( array_keys($markup_array), array('section_label', 'tbody_', '_tbody'));	
/*
remove first td of all customer data
*/
foreach($customer_data_keys as $cdKey){
/*
quick and dirty explode 
Note:
could also (should probably) be done by regex or parsing dom document 
or whatever else one can think of 
as perhaps - though not very likely - one day there might end up being a space 
or something between the "</td><td" for some as yet unknown reason
it's just a note if you want to make this more "future proof" 
*/
$orig_string = explode('</td><td', $markup_array[$cdKey]);// explode by closing/opening td's
$new_str = '<tr><td'.$orig_string[1];//prepend tr->td to second part of exploded array
$markup_array[$cdKey]	= $new_str;//put it together
}
return $markup_array;	
}

as it turns out – looking at that site – your problem has nothing to do with any of this .
It is simply due to the order page being cached (or perhaps – less likely though – some php session problem)

If I clear my cache and go directly to your orderpage (https://yoursite.tld/pantanir/) without ever having put anything into the cart, i STILL get items from some previous / other users.
the order page must not ever be cached
https://docs.wp-pizza.com/getting-started/?section=setup
https://docs.wp-pizza.com/faqs/?section=using-a-cache-plugin

i would also suggest you update wppizza to the latest version (3.10.7) which addresses a few other potential issue

PS: please mark any reply as private

some random epson doc i have come across which may or may not be relevant
https://files.support.epson.com/htmldocs/pho925/pho925rf/vari_2.htm

it says there :

“Printing on roll paper
You need to make your data 4 mm wider than the roll paper.”

so a -4mm (left only ?) margin on the body *might* be what works – assuming your printer is an epson printer….
just posting things as i come across them here for future reference perhaps

> I have this problem in many thermo printers.

I am sure you do.

<rant>
(the majority of) thermal printers are technologically still stuck in the 80's 
from what I can tell
All I (i.e wppizza) can do is output valid, standard html and/or plain-text 
documents (and with the pdf plugin pdf's too - as attachments) that can be 
send to and printed by a/the printer. 
It is completely out of my hands as to what the printer does with this 
when printing.
From what I can tell, most thermo printers simply do not follow *any* standard 
and/or do their own thing as to whatever the company has dreamt up at the 
time the format should be without any consideration at all as to any standards.
Afaik, in many cases one cannnot even select the most basic things like  fonts or fontsizes , 
let alone anything more specific....
I must admit, I find the arrogance/laziness (call it what you will)  
of printer manufacturers on that front quite staggering to be honest .....
(i could rant on about this for quite a while here, but it wont help you of course, 
so i wont ------- for now :))
</rant>

So, that off my chest (sorry) back to the issue at hand:
(You did not address this question) – Did you try setting your template you are using for printing to plaintext ?
is the output better/worse ?
perhaps could you post a screenshot of both outcomes ?

Btw, I’m not trying to be difficult, just trying to find the most appropriate workaround/solution to what really should be someone elses problem (I’m referring to printer manufacturers here, please don’t take this as a dig at you !)
to perhaps come up with something that helps not only in your particular case but might be generally useful for others too coming across this post…..

the print templates print what you have set up in wppizza -> templates -> print (or “emails” if your printer prints from the emails received – depends on setup and what your printer “listens” to )
if you want to change the order of things – i.e move things below some other things – simply drag and drop there and save

btw, this is completely independent of what the confirmation page shows (which follows the settings in wppizza->order form)

sorry for the late reply…i had actually missed this (but now know of course)

other than using a printer that can connect directly to email accounts for example, I cannot see any other equivalent solution anywhere that would allow us to do what google cloudprint does. so this is a bit , errm, annoying (to say the least)

i live in hope that perhaps someone else will pick up the pieces (IBM, facebook, MS anyone really with the resources) and we can continue using it after 2021 – or perhaps google will change their mind. This change will affect 1000’s of servers/sites after all …..

if anyone else reads this and has some idea as to how to replace this , I would be more than happy to hear it.
I couldn’t find anything myself that allows to print directly from a website to a network printer without having to have some computer in the middle turned on all the time (and that’s not propriotory and only works for one set of printers…)

again, any ideas would be appreciated on that front

i would also suggest you turn on debug too and check your debug log
https://docs.wp-pizza.com/troubleshooting/