I click on “Settings” and a window opens. I click on the "..." and choose "Modify" OR "Delete". I click on one of the two, a second window opens to perform the modification or deletion action. The "..." pop-up (with Modify or Delete) remains open and the buttons are active (it is possible to click on them).

This display bug is available: 

• with the "Modify" button in the "..." pop-up
• with the "Delete" button in the "..." pop-up

The “Settings” button is found in the Calendar tab and the Resources tab