Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
There is a temporary and technical workaround while waiting for this UI flaw to be fixed. By going to developer tools in your browser (F12), and using the leftmost icon (Inspect, Ctrl+Shift+I) to click an area that highlights the entire background, you can find the code section that says
element.style {
}
and in between, add
element.style [
background-color: #ccc;
}
to add a light grey color. (This can be changed by clicking the small grey square.
This will disappear when you reload the page.