Here’s the input:
And here’s the result:
In the same score (the chords should be the same in both measures):
The root of chord symbols with altered bass notes is automatically hidden when (if my memory is correct) they come after a previous chord symbol with the same root.
You can change this if you always want to show the root in all circumstances in Library > Engraving Options > Chord Symbols.
Edit: Amazing, exactly the same question asked just a few minutes before yours:
WOW! Fast and accurate! Thank you! That was it:
