Hello! I'm using DisplayFusion Pro on Steam 9.7.1

When I snap two Windows to the sides in my primary monitor, a "middle bar" is visible when I hover the mouse over the line between them, allowing me to resize them both at the same time, like this (df1):


However, in my secondary monitor this doesn't happen (df2):


How can I fix this?
Thanks in advance!

EDIT: Added attachments because embedded images didn't seem to work