Filmora
Filmora-Video Editor, Creator
Powerful Yet Simple Video Editing App
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Think Bigger From Filmora User Guide

Borders

Adding borders is for the Split Screen feature.

1 Choose the Split Screen template you would like to use under the Templates tab.

2 Drag your videos on Media to the split screen.

3 Enable the Border option to add borders around the clips in your split-screen.

4 You can adjust the color and size of the border.

Add Border to Video for Splitting Screen
Add Border to Video for Splitting Screen