As background information, a lot of multiple-line text fields ended up being populated with HTML formatting code as part of a migration exercise conducted in Jan 2019. The following illustrates an example of what is displayed in a multiple-line text field (all confidential text was blacked out) for those pre Jan 2019 client records:

Since the migration occurred in Jan 2019, users have been adding information into the multiple-line text fields of the client records in question so 2 years down the track, we now have client records with a mixture of pre Jan 2019 showing HTML code and properly formatted text.
With 2020 Release Wave 1, the Rich-Text Control was released and after enabling it against the multiple-line text fields, the pre Jan 2019 HTML code was removed to just show the text that had been migrated over (ie, which was fantastic for users as they could now read pre Jan 2019 text). The downside is that the information that had been entered after Jan 2019, is now showing with a smaller font size and in a different font colour (light grey) which has made it extremely difficult for users to read).
My questions are as follows:
1. Has anyone encountered this situation (ie, whereby the font size and colour changed as soon as the Rich Text Control was enabled) and if yes, what solution was implemented to fix this situation?
2. Is there a property against the Rich Text Control which dictates the font type, size and colour for the text displayed in the multiple-line text field? If yes, where can I find it?
Many thanks in advance.
Michael