You have turned on iCloud drive and desktops and documents box in Mac OS catalina 10.15.7 https://support.apple.com/en-in/guide/mac-help/mchle5a61431/10.14/mac/10.14
You go to finder > in iCloud section > in iCloud Drive > Documents you create personal documents they are mirrored in iCloud.com or you create directly documents from iCloud.com they are synced in finder > documents ( acts as vice - versa ) .
If you are talking about iCloud icon , open system preferences > click on Apple ID icon > in the side bar of the window you can see iCloud icon and launch pad can be opened with different ways open spotlight , and type launch pad in it , click on enter , other ways , open finder > in applications > right click on launch pad and click on open or double click launch pad application , some users use trackpad to open launch pad https://support.apple.com/en-in/guide/mac-help/mh35840/mac
If you compare Mac OS catalina with previous versions in system preferences > the iCloud icon was available ( I don't exactly remember the previous version settings ) , but in recent version the location of iCloud is changed as described above .