Convert Mac OS Extended (Journaled) Time Machine contents to APFS Clicking on any of the dates on the right hand side, as shown in the picture, doesn't do anything. What might be the issue here?

I can access Applications perfectly fine though. The others are greyed out.
I think it's because the old computer was Mac OS Extended (Journaled) whereas the new computer is APFS. Is there a way to convert the contents of the time machine to APFS?
If clicking the date doesn't move to that date, it's because there is no backup for that selected location. It doesn't mean there's no backup at all.
See this image…

I have backups only for my boot drive. Other drives have been removed from Time Machine's backup prefs. If I start from 'Now' then all the drives show in the list on the left. As soon as I scroll back, then the other drives grey out, because there's no data [Acronis is an NTFS volume &amp; Time Machine doesn't know what to do with that].
So, to see what's really there, start from your boot volume &amp; go backwards from there. At each step some locations may grey out, but the boot drive itself should have data going back in time.