Relevant for
The Original Prusa MK4 and MK3.9 are equipped with a color LCD screen that, among other things, supports G-code thumbnails and QR codes.

The footer of the main screen can be edited to show the features you wish to be shown on the main page.
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I would appreciate a description of what some of the items do or their purpose. I'm trying to troubleshoot a few things, and it's difficult when I don't know what many of the menu items really do. Here are a few things that I don't understand, and I don't know if they are a part of my problems or not.
Preload to MMU Advanced (Only Available when MMU is installed)
Manage Filaments (Only Available when MMU is installed)
Cutter
Hello.
RGB status bar: https://help.prusa3d.com/article/status-led-explained-mk4-xl_418975
Input shaper: https://help.prusa3d.com/article/input-shaper-mk4-xl-mini-_451816
Touch Sig workaround: https://help.prusa3d.com/article/touch-screen-mk4-mk3-9-mk3-5-xl_689554
As for 'Set Ready'... this function allows you to upload multiple print jobs to the printer via Connect. After you finish the first print and prepare your printer for another job, you just click 'Set Ready,' and it automatically starts the next print job.
As an example RGB Status Bar, Set ready, Input shaper, Touch Sig workaround.
Is there any site with the information I need?