Mac OS 10.15.5
Driver[0] Name: AMD Radeon Pro 580X OpenGL Engine
OpenGL Version: 4.1 ATI-3.9.15
Illustrator Version: 24.1.3

I frequently hide Illustrator with cmd-H keyboard shortcut.
I kept noticing the system chime when returning to Illustrator.
I recently noticed the zoom entry at the lower left corner was highlighted when returning.
I don't think this should be highlighted, waiting for me to type a zoom percentage when I come back to Illustrator. The chime is for an incorrect entry.