this sounds more like your theme is hiding certain things in mobile view as the plugin does not do that
unless you are telling it to using the available (shortcode) attributes if adding the minicart by shortcode instead of using the widget
(i cannot say any more without a link to your site I’m afraid)

cannot see the minicart there being used/enabled ?!
(mobile view or not)

ok, i – mistakenly – assumed we are talking about something else (my fault)

that out of the way, there is some css in there (i.e display:none) that tries to account for the more limited space available in the cart on small-screen devices.

that said, at first glance at least , you might actually have a point that I might be overdoing things here.
Though I am quite certain that “hiding” the quantity display (as that’s what we are talking about here) was done for a reason at the time , with all the adjustments done afterwards, this might now be the wrong thing to do.

Allow me to think about this for a bit (taking into considerations several setup/theme possibilities), and if it turns out that this is somewhat overkill, I’ll gladly get rid of that declaration in the next update

thinking out loud for a minute, i would think that this declaration still has a role to play, but should perhaps/probably only apply to screen/device sizes smaller than it is at the moment (which is 420)

i’ll need to play wit that is for a bit.
no promises – as i do not know yet the implications it might have – but thanks for flagging the issue nevertheless

will post it here

and you can always override the css anyway if you want it done sooner
the one that does it is this
@media only screen and (max-width: 420px)….