I sorted this successfully:
Searched C:\ drive for JAVA.EXE
Results beside SweetHome logo caame up with multiple versions of JAVA.EXE, JAVAW.EXE & JAVAWS.EXE
I opened each in turn and applied the following:
Find java.exe you installed. - (You've just done this)
Right click -> Properties
Go to Compatibility tab
Check Override high DPI scaling behaviour.
Choose 'System' in the 'Scaling performed by:'
Check 'Apply' to each in turn.
Do this for all of the above 'exe' files
Restart the computer
Open SweetHome and I hope you find the issue resolved.
I don't know if all of them needed modifying but doing so worked for me.
Lawrie