Sundays and Saturdays do not appear unless they are checked under "Workweek days."
This evening I switched to the already running Thunderbird session and the displayed calendar seemed different. It took me a moment to realize that Sundays and Saturdays were not displaying in the main calendar section (see image).
I shut down Thunderbird and restarted it, at which point it also installed an update (so I'm now running 91.3.1). However, those two days were still missing. The only way to get them to display was to put checks next to them in the "Workweek days" selection, which I don't believe I've ever had to change. However, that produces a display with no coloring on those two days, as if it was a 7-day work week.
الحل المُختار
Try this: launch in safe mode, 'Reset toolbars & controls', 'Make changes & restart'.
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I don't have Saturday and Sunday checked in Workweek, but they appear in the Week view (see picture). Test for a broken layout by running in safe/troubleshoot mode (hold Shift when launching TB).
Saturday and Sunday showed up in troubleshoot mode, but disappeared again when I rebooted. They do not show up in "Week" view, either. I only have two extensions: Mailbox Alert and Send Later. I tried manually disabling them and rebooting, but it did not fix the issue. Those days only appear if I put a check next to them in "Workweek Days."
So the layout appears broken, but I'm not sure what to do about it. Any suggestions?
الحل المُختار
Try this: launch in safe mode, 'Reset toolbars & controls', 'Make changes & restart'.