Calculate width from bottom mobile menu to top for SIDE menu

Hi gents,

I need your help, searched for forum but couldn’t find solution thus far. I’m building my app for almost 1 year now and it’s ready soon to go out, but now I want to optimize performance. So far I managed to find everything on forum, but this is my first post as I could not deal with it.

I am using the right menu plugin for mobile users, but I would like to not do it with plugin, as it’s slower and can not be modified the way I want, but rather with group focus or some other way.
Let me explain:

RED marks bottom floating group, that is menu. When I click on last item on the menu (bell icon atm), I would like to open another menu that is marked with GREEN color.

I can make this happen when I put Group Focus on click of the icon, let’s say -500 pxs, and then it will show the menu, but it will never be 100% height of the screen view.

How can I calculate this number of pixels so it always fills up entire page.

(Don’t mind the yellow marking).

Thank you very much for your help gents.
Cheers

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Any help here gents? Still struggling…