According to the interweb, there’s a way to automatically avoid horizontal chord symbol collisions, that is, chord symbols that overlap each other. ENGRAVING OPTIONS > CHORD SYMBOLS > POSITION > enable “avoid collisions”. Trouble is, I can’t find the “avoid collisions” box to click it. I’m on Dorico Pro 5 Version 5.1.81.2225 (Jan 16 2025). What am I missing?
I see in the version history that it was introduced in 6.0.20, that’s why you don’t see it…
A new Avoid collisions option has been added to the Position section of the Chord
Symbols page of Engraving Options, allowing you to determine whether chord
symbols should avoid collisions with the staff and objects protruding from the staff
by default; this can be overridden for individual chord symbols using the
corresponding Avoid collisions property.
I need to ask my mom for the $100 for an upgrade!
Oh yes 
And not only for this feature but for many, many big improvements since version 5!