The Search key is located at the same place on a keyboard as the Caps Lock key on PC and Mac keyboards.
Click the clock on your Chromebook and select Settings (the gear). Scroll down and click Keyboard under “Device. " Click the drop-down menu next to “Search” and select Caps Lock. Now, when you want to type in all capital letters, you can press the Search key to toggle on Caps Lock. Then, just tap it again to turn Caps Lock back off.
To turn off Caps Lock, tap the up-arrow key again one time.
Open your iPhone or iPad’s Settings app. Tap General. Tap Keyboard. If the Enable Caps Lock switch is on (green), tapping the up-arrow key twice will activate Caps Lock. If it’s off, it won’t.
This should work on most Android keyboards. If you installed a different keyboard from the Play Store, it may have a different Caps Lock key. Double-tap the Shift (up-arrow) key again to turn off Caps Lock.