Hello !
This is not something from Microsoft Edge. It is usually an on-screen display (OSD) from the monitor or display utility, showing the monitor’s current picture mode (for example Standard, Multimedia, Movie, etc.).
What monitor are you using with your Asus PC ? Did you install the driver manually ?
Check in your installed programs if you have software that controls your monitor. Check for ASUS DisplayWidget, Dell Display Manager, HP Display Center..
Looking forward to your answer !