Touchpad Acer Chromebook C720P
How to do a right click on the touchpad of your Chromebook? The next you need to know otherwise it will not work:
If you're using a Chromebook, use the touchpad to move the pointer and select items on the screen. Here are some gestures and actions supported by the touchpad:
Move the pointer: Simply move your finger across the touchpad.
Click: Just press down on the lower half of the touchpad. Since tap-to-click is enabled by default, you can quickly tap the touchpad to click.
Right-click: Click the touchpad with two fingers.
Scroll: Place two fingers on the touchpad and move them up and down to scroll vertically, left and right to scroll horizontally.
Drag and drop: Click the item you want to move with one finger. With a second finger, move the item. Release both fingers to drop the item at its new location.
Source: https://support.google.com/chromebook/answer/1047367?hl=en