Surfdeprived

Using Mac 10.15.4 and Affinity Photo 1.8.3 -- Will crash every time I try to adjust the font size using the drop-down slider. This only happens when using "Separated Mode". When Affinity is in its default mode this doesn't happen. This wasn't happening prior to the last update. Edit: It can be in "Separated Mode", but only if I click "Merge All Windows" to get everything together before adjusting font size with the slider.