The latest version of Meta Horizon Worlds, version 115, includes the ability to stop and take a break by pressing the pause button. - Oculus Blog
Meta Horizon Worlds v115 Release Notes: Press Pause to Take a Break
The latest Meta Horizon Worlds update, v115, has been released! It features the rollout of the Pause feature and improvements to world importing. For more details, visit the Oculus Blog.
Source: https://www.meta.com/blog/quest/meta-horizon-worlds-v115-release-notes-press-pause-to-take-a-break/