Apps are not stored in iCloud. The cloud icon just means you can download it again, but the download actually comes directly from the app store.
How to uninstall on Mac by using the Launchpad? It's easy and this manual method works like this: Click Launchpad icon in your Mac's Dock. Find the app you want to delete. Click and hold the app until it starts shaking. Click X in the top-left corner of the app icon. This will uninstall the app from your Mac. Mar 31, 2018 Macs also have no way to uninstall or install operating system features, so there’s no way to easily remove the many applications Apple included with your Mac. On OS X 10.10 Yosemite and earlier, it was possible to open a terminal window and issue commands to delete these system apps, which are located in the /Applications folder.
There is no way to remove previously purchased apps from that list however. They don't take up space in your iCloud in any case, and are just links to the apps in the store for convenience.
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In most countries companies are required to keep archives of sales for tax purposes so Apple maintains a list of apps you have bought for that and to have a way to track your purchases and be able to let you access previous purchases again without having to pay for them more than once.