In Maya 2022, the menu highlight is a visual indicator that shows which menu item is currently selected. It can be turned off to improve the visibility of the menu items, especially when working with complex or cluttered scenes.
Turning off the menu highlight can also be helpful when recording screencasts or creating tutorials, as it can reduce visual distractions and make it easier for viewers to follow along. Additionally, it can improve the performance of Maya, especially on older or less powerful computers.