So I tried creating a split on a Dell 3007WFP in Portrait mode.

After creating the split the text in that display is now blurry. I ended up deleting the split but the text is still blurry also in the main Monitor Configuration window the display is now only showing in the top corner of that display. Rebooting or turning off DisplayFusion does not correct this issue.

Would love to get the text to display clearly again. I even attempted to use Cleartype but you cannot even read the texts in the Cleartype prompts.

After flipping the orientation a few times, some splits returned to the Main Monitor Configuration window for that display. I deleted the splits and was able to get the monitor to display in full portrait mode again without the blurry text.

No changes in monitor configuration window itself, all changes in the Splits and Padding window. DisplayFusion picked up the resolution/orientation from Win10. I did make a few attempts on the Splits before settling on the desired configuration.

Thinking on it now, it was actually two issues. First was the blurry text. Second was the Monitor configuration showing a split where none existed in the Splitting menu.

You can see in attached pic, Display 3 shows the display in quarters but only one quarter is active. But in the Splits menu it has no splits showing. So DisplayFusion got mixed up, set the display to only a quarter and was forcing the resolution of one quarter to the full display would explain the blurry text.

The fix was playing around with orientation, I think flipping the Portrait mode did nothing but going into Landscape and back to Portrait was what brought the quarter display splits to show on the Splits menu which I then deleted and the display 3 went back to normal.