Notification Center Question, Please (Mojave)

Hello,

Seems like every day I get the "Disk Not Ejected Properly" message to perhaps 15-20 of them.

Related to Time Machine. No idea why, or how to prevent. Any suggestions ?

Anyway, these messages are a real pain, and take up, and hide, a good portion of my Desktop.

Would like to prohibit them from showing, ever.

I thought I could do this in Notification Center, but am not sure if this is so, or not ?

If doable, what do i click on, etc. to do it ?

Fine by me if I prohibit, also, all other Notifications, if this is necessary.

If Notification Center isn't the way to do it, any suggestions on how to prevent these

Disk Not Ejected Properly messages from appearing ?

Much thanks, and Happy Holidays,

Bob