By default the HTMLProvider Editor is in a very tiny place in a very small Persona Bar.
Luckily the HTMLProvider Editor is also a module. So, I always create a page and drop the module there. That will allow for enough wiggle room to tweak.
Just tested locally on 10.2.1 and all looks good.
Did you check with default theme?
If it is connected, I don't know but Lucene has a problem :-) Did you try :
?
As a quick short term fix, do you know you can also edit the CKEditor config file in the portal root?
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