The rest of the mullion cap is fine it’s that little flapp bit on the the outside that snaps and cracks (this is the 2nd one in year - the first one was done under warranty but missed how it got replaced just come home to loads of plastics shavings over the floor
They do snap but only when they catch on something, if the doors are working right there should be no problems.
To get off... well a very fine paint scraper gently tapped in may work, or a blade. They are tricky to get off in one piece if you aren't extra careful
That looks like old Anglian profile, if you look along the bottom of the glass units, within the glass you should see 2 black pips, that'll confirm it's Anglian
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