This^^^^
The Garmins certainly have some quirks that take a bit of 'getting used to'..... My Edge Touring has a habit of switching route recalculation on every half-dozen rides or so, while also changing my screen data fields as
@T4tomo says. This results in much hilarity when you get well into a long pre-planned ride in unknown territory then discover you are miles off the route because the Garmin has chosen to re-route you onto 'more suitable' cycle paths than the 'terrible' direct roads you had planned.
I think
@ColinJ @Julia9054 experienced this a few years ago on one of the forum rides to scarborough when my garmin decided to divert us onto the bumpy, muddy forest trails of the forest near Dalby in preference to the roads as we approached the end of our trip and my name was 'literally' mud!
I now check the settings prior to setting off nearly everytime I use the Garmin, but this really shouldn't be necessary.