You will want to see this thread on the same issue for a possible workaround:
I talked with the Paratext ‘Product Owner’ Glenn about this issue at BT2019. He acknowledged that the interface is noticeably fuzzy, when compared with using it with the registry changes mentioned in the link above.
My recommendation to everyone that feels handicapped by this issue is to submit a ticket, simply telling them that your are affected by the issue, and asking them to bump it up on the priority list.
You can reference my ticket number “Dictionary Text appears blurry (PTXS-19971)” so that they can link the tickets under a single issue.
Thanks