Hi JamieTrask,
As per your description, “I would like to turn off the suggestion to 'go to the last place' in a document” may I confirm with you does it mean you want to turn off feature "Welcome back, pick up where you left off" in Word 365 document. If yes, then
you may try following steps to disable it from registry.
1. Press
Windows +
R and type
regedit and press Enter to open registry.
2. Navigate to the following location:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Reading Locations
3.Delete all the sub keys under
Reading Locations.
- To make this key read-only, right click over it and pick
Permissionsand make sure only Read option is checked.
- Click on Advanced in the above shown window. Now uncheck the option
“Replace all child object permission entries with inheritable permission entries from this object”.
- Click Apply followed by
OK.

***WARNING:***Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Edit at your own risk.
I appreciate your patience and understanding.
Best Regards
Waqas Muhammad