The command to activate / deactivate a filter on a scene item is filter

The parameters are;

• scene=<scene name> (case sensitive)
• group=<group name> (optional)
• item=<scene item> (case sensitive)
• filter=<filter name> (case sensitive)
• delay=<time in ms> (optional)
• active=<0, 1 or * (inactive,  active or toggle current setting)>

The scene, item and filter parameters are case sensistive, so must be typed exactly as they appear in OBS.

The group parameter must be used if the scene item is in a group (available from OBS Studio v22).

The optional delay specifies a time (in milliseconds) to wait before running the command.

Example - activate the xray filter on the Camera source.