sometimes what it happens is that is toggle out try to press numpad1 if it work at least you know it is not broken, the next thing will be see if you have the same settings as i do go to your mod list/mod options search for: hwyla or waila. Then press waila and go to the config it will show a the name of the mod and a warning with 3 options Waila , Modules and Back. press Waila once again to proceed
if the Shaw/hide waila is "hidden" change it to "visible"
check if the debug menu can be interfering with the mod change the setting *hide from debug menu* to NO.
Also check if the "Toggled/Maintained" is on TOGGLED other wise you will have to be pressing numpad1 if you want to check the description
After that close all the settings and go back to the game check if you have Numpad ON and hold press Numpad1 once and see if it stay there please check that NUMlock is ON in all times other wise this will not work until you activate hopes this manage to help for those people that like to press all the buttons of the keyboard and dont know what we mess up it is important to make clear that im currently playing a Ver of this mod in 2022 this might or might not work for you people of the future sorry for my bad English the mod pack im using is call "[The 1.12.2 PACK]"