Have you tried with F3? Is F3 actually the button that zooms the radar map for you?
Select Minas Tirith, be sure not to have toggle_fow cheat turned on, make sure Denethor is the governor and has the Palantir ancillary. Press F3, or the button which is set for zooming on the map.
If it still doesn't work, I would suggest to reinstall TATW 3.0 both parts + TATW 3.2 Patch, cause, even in this new screenshot you do not have a Palantir icon in your bottom left corner. Something got corrupt..
You could try to refresh whole TATW data and see does that fix the issue of missing Palantir( you would need to start a new campaign to check it, or try your current Gondor campaign again):
Delete map.rwm file in
M2TW/ mods/ Third_Age_3/
data/ world/ maps/ base
folder, and delete all
*strings.bin files in M2TW/
mods/ Third_Age_3/ data/
text folder ( there should be
27-28 *strings.bin files).