Overview
This article explains how to set a custom window size when recording a new scenario. By specifying a custom width and height, you can create tests tailored to specific screen sizes.
Steps
Click New scenario on the Scenario list screen.
Click the Window size dropdown and select Custom at the bottom of the list.
Enter the numeric values for width and height in the input fields that appear below the dropdown.

Enter any other required information and click Start recording. The browser will launch with the specified window size, and recording will begin.
Notes
The width and height values must be integers between 1 and 8000 (in pixels)
If you select a preset value (e.g., 1280 x 720) from the dropdown while Custom is active, the custom input fields will be hidden, and the selected preset value will be applied.