This tutorial mainly builds upon what was learned in my previous tutorial on sideloading applications onto a smartwatch. If you already have USB debugging enabled on your smartphone, as well as ADB and Bluetooth debugging enabled on your smart watch, then this guide will be quite simple since you will only need to enter in a small number of commands.
To adjust the scaling, do the following:
1: Connect your smartphone to your PC via the USB cable.
2: Press the Windows + R key, and type in cmd and then press enter.
3: Enter in the following commands
adb forward tcp:4444 localabstract:/adb-hub
adb connect localhost:4444
adb -e shell
4: you should now have a shell for your smart watch. this will allow you to run a wide range of commands, including the one that we will be using wm density.
For example, a command such as the following will allow you to fit more content on your screen.
wm density 200
(Values larger than 280 will make things larger, and values smaller than 280 will make things smaller)
The use of this command will depend on your personal preference, you can use get very granular in your adjustments and increase or decrease the scaling in very small increments.
The default wm density value is 280. Larger numbers will make things on the screen larger, and smaller numbers will make things smaller. Though in each case, the watch face that you use, will remain the same size and fill the screen.
Furthermore, if you run the wm density command with no value after it, it will tell you the default value, as well as any override value that you are currently using. I typically use 190 or 200 as it makes longer notifications and emails easier to read, as there will be fewer line breaks.
If this is your first time using ADB on your smart watch, check out my reply to this thread for the relevant steps to getting ADB running on your smartwatch.