Got a solution.
To permanently return to a good, soothing source scale factor (= 1), you need to edit the Chrome desktop:
sudo nano / usr / share / applications / google-chrome.desktop
Find the line that contains the path to the binary file and change it from
Exec = / usr / bin / google-chrome-stable% U
to
Exec =/usr/bin/google-chrome-stable -force-device-scale-factor = 1% U