I ran SQL Central on my Window 10 machine, with a 2560 x 1440 display. Here’s what I found:

1. With a 225% text size scaling, and with the “Override high DBI scaling behavior” box unchecked, the fonts in SQL Central look about the right size. (That check box is on the "Compatibility" tab of the properties for the SCJVIEW.EXE file, as shown in the image from 23 July 2018.)
2. Reducing the text size scaling to 100% and leaving “Override high DBI scaling behavior” unchecked gives the results we see in the image above: the menu text (“File”, “Edit”, etc) look OK, but the rest of the text in the application is too big.
3. With text at 100%, checking “Override high DBI scaling behavior”, and setting the combobox under it to “Application” makes the menu text too large, but the rest of the text in the application is better – between 1.5x and 2.0x too large. But at least it’s legible.
4. In a directory where you have permissions to write a file, run “scjview -XBatch”. This will create a file called scjview.bat which uses JAVA.EXE to run SQL Central. With the “Override high DBI scaling behavior” box unchecked, the fonts in SQL Central are much closer to expected size.

I would have to recommend you do the last thing – generate a batch file, and run that when you are using your 4K TV.