it is enough to fix the Auth theme, but the Admin theme needs some restructuring for narrow screens: it opens with expanded menu, the elements do not fit at the top and the sandwich button is misplaced. The left menu maybe is not the best idea for phone screens.
I may offer a PR for fixing the metadata, but that should perhaps be done together with redoing the UI, which I am not particularly good at.
It can be fixed partially by updating the metadata to Bootstrap 5 format: on line 22 of file
src/View/Metadata.php
replace$this->meta[] = ['viewport' => 'width=device-width, initial-scale=1'];
with
$this->meta[] = ['name' => 'viewport', 'content' => 'width=device-width, initial-scale=1'];
it is enough to fix the Auth theme, but the Admin theme needs some restructuring for narrow screens: it opens with expanded menu, the elements do not fit at the top and the sandwich button is misplaced. The left menu maybe is not the best idea for phone screens.
I may offer a PR for fixing the metadata, but that should perhaps be done together with redoing the UI, which I am not particularly good at.