Have you checked these first?
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During editing a holiday schedule, the selection checkbox is missing from the entries, making them all non-selectable, thus cannot be deleted. I have attached a screenshot below, there should be a "checkbox" on the left side of the row after the drag handle, but is missing.
After all of these years there are still areas of osTicket that I haven't yet found. And here is one of them!
I see what is happening: the Edit icons are covering the checkboxes.
Add this to Theme Options > Custom CSS:
#schedule-entries i.icon-edit {
margin: -5px 5px 0 22px !important;
}
The same error is still present when editing Lists (Manage->Lists), e.g. Ticket Statuses.
I slightly edited your fix:
#list-items i.icon-edit {
margin: -5px 5px 0 22px !important;
}