Panasonic Lumix G100 Mirrorless Camera with 12-32mm Lens - Manual (Page 268)

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10. Recording Videos
[Frame Marker]
A frame with the set aspect ratio is displayed on the recording screen.
This allows you to see during recording the angle of view that will be
achieved with trimming (cropping) in post-processing.
[ ] [ ] Select [Frame Marker]
[ON] Displays video grid lines on the recording screen.
[OFF] —
[SET]
[Frame Aspect]
Sets the aspect ratio of video grid lines.
[2.39:1]/[2.35:1]/[2.00:1]/[1.85:1]/[16:9]/[4:3]/
[5:4]/[1:1]/[4:5]/[9:16]
[Frame Color] Sets the color of video grid lines.
[Frame Mask]
Sets the outer side opacity of video grid lines.
[100%]/[75%]/[50%]/[25%]/[OFF]