Presuming you need to show your POS transaction activity to your customer, Dealpos provides that feature, it's called Customer Display. You can open the link to get to know more about Customer display.
This article will explain how to install it into your browser with our built-in plugin in Google Chrome so you do not have to drag it manually to your second screen.
I. Install the plugin
Step 1. Open display.dealpos.app
Step 2. Click the plugin button and install it
Step 3. A new window will appear
Note: You need to move it to your second screen once, and every time you open it, it will appear in the second screen.