For those of you who often want to change the icons on your home page, the process has changed in Android Q, also known as Android 10. The setting is buried and now applies to more than just home screen icons.  In earlier versions of Android, especially Oreo and Pie, you can long press your home page, select "Home Settings", select "Change Icon Shapes" and then choose between the circular default option, square, rounded square, or teardrop icon shapes. Super easy. This was first available on Pixels, but expanded to other devices by Nokia, Essential, Moto, et al.
Well, in Android 10, which is only available for Pixel Pixel Pixel Pixel 2, Pixel 2 XL, Pixel 3, and Pixel 3 XL right now, the "Change icon shapes" option is nowhere in "Home Settings". In fact, you will not find it anywhere if you not only have "Developer Options" unlocked. If you do not have that menu unharmed, it is first to start if you want to change your home screen character.
Step 1: Unlock development options (if not ready)
Go to "System" in the Settings app, then press "Advanced" to expand these options. Then click on "About phone", and then expand its own "Advanced" section. Finally, fast at least seven times on "Building Number" until you see "You are now a developer!" You may need to enter your PIN to continue.
If you only unlock "Developer Options", you can only hit back a few times to return to the "Advanced" menu in the "System" settings. Otherwise, go to Settings -> System -> Advanced -> Developer Options.
Once inward, scroll all the way to the bottom and press "Icon Format". Just as before, a couple of different options appear: the circular unit standard, tear, square and rounded rectangle. Note that "Square" is completely absent here, and "Rounded Square" is now called "Rounded rectangle" for some reason.
Why moved the icon settings from "Home settings" "to" Developer Options "in Android 10? Because it's more than just the home screen now. Quick settings (drop-down menu), Overview (multitasking interface) and the Share menu are all affected by a change, as are other areas where icons are displayed.
Below are examples of the formal options available to Pixels, which show their appearance in the Quick Settings, Overview and Share menu, as well as on the home screen.