While Chromebooks don’t have a separate right-click button on the touchpad, that doesn’t mean the function isn’t available. Should you need to right-click on something, there are a couple of ways to do so without the need to plug in a mouse.
Right-Click Using Two Fingers
The most straight-forward way of right-clicking on a Chromebook is to click the touchpad with two fingers. Just like that, a right-click context menu will appear.
However, you can take that simplicity one step further by enabling the “Tap-to-click” feature.
First, click on the clock to open the system menu and notification tray; then click on the Settings icon.
Scroll to the bottom and click “Advanced.”
Scroll a little bit further until you see the “Device” section. Click on “Touchpad.”
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Source: How-To Geek