Autohide worked on Object Dock 1 and then on 2, but it's impossible on version 3.
I think the developers don't want to go through the trouble of finding and adding this option to version 3. 
For my part, I was able to do it by manually editing the files:
1) Go to Settings --> Troubleshooting Options --> Open my ObjectDock Setting.
2) Edit the CurrentTheme.ini and CurrentTheme_Backup.ini files.
3) Look for the lines with Autohide=XX and set the values to 1.
Do this for all the Docks you have, then back up the files.
That's it, nothing more to do... so the developers aren't able to do this, which is sad. 
It's been working and has been working without any issues for months, on several PCs (Windows 10 and 11).
