Cannot Change Capture and Share Settings (Xbox One)

try changing the length in capture and share go to capture settings and you can set how long you want to record

Try going into Settings, Preferences, and then Capture & Share.

From there check to see if under Capture in the first block that says, "Allow game captures", and see if it either shows: "Captures by me or games" or "Capture by me."

If it says, "Don't capture", then change it to either one of the other two options.

What version of Xbox OS you'r using?

After OS version - 10.0.18363.7194 (19h1_release_xbox_dev_1910.18363.7194.190929-1945) Release date 10/8/2019; whe got the
new feature:

Flexible capture settings

You now have more control over what gets captured and recorded in games. In Settings > Preferences > Capture & share, choose between “Captures by me,” “Captures by me or games,” and “Don’t
capture.”

Try to change that.

Are you referring to the limit on the Series X/S?

In the Settings menu on your console, select Preferences, and find and select Capture & Share. This allows you to change the recording length, resolution, capture location etc. Changing these allow you to get up to 3 mins of recording.

Try going into settings > Preferences > Capture & Share to chance the length of your captures. It may have been set to the 15-second capture mode.