Q: What is this feature?
A: It is a feature you can turn on in SAP General Settings under the Font & BKgd Tab
Q: Why do you not support this feature?
A: Because it breaks backward compatibility in the SAP Business One SDK, making certain Add-on (not just ours) have issues with font-sizes. This is what caused the SBO9.3 PL10-12 Font size issue
Q: But that issue was fixed in PL13... Why is then still a problem?
A: Well, actually it was not fixed. Instead, SAP rolled back their code to how it was in SBO 9.3 PL09 and introduced this new checkbox so the new code only ran if this checkbox was activated. So the checkbox is essentially just a workaround for the fact that they could not get the two features to work at the same time.
Q: What happens if I turn the feature on and run your add-ons?
A: Then they would react like as if you were running SBO9.3PL10-12 (and the workaround for the issue would need to be applied)
Q: Do you plan at some point to support this checkbox?
A: Unfortunately not as we can't see a way that the SAP Business One SDK based screen can ever co-exist with this feature. So we strongly recommend you never turn it on