Clean up Your Apps
Speaking of apps, your app grid may also be messy because of the number of apps displayed rather than the arrangement. That’s because, by default, pretty much any app on your iPhone that has a watchOS counterpart will automatically install on your Apple Watch.
You can delete apps from your Watch by pressing down on them in the app grid. You can also just select them from the Watch app and toggle Show on Apple Watch. Lastly, you can keep apps from auto-installing by going to General > App Install and disabling Automatic App Install.