There are two ways to delete allocations in Float.
From the allocation menu
Open the allocation menu and click Actions > Delete.
From the Schedule
Right-click anywhere on the Schedule to bring up the bulk actions menu, select Delete, and click on the allocations you want to remove.
💡 Here's a tip: If you've accidentally deleted an allocation from the Schedule, you can undo the last action/s using Ctrl-Z (PC) or Command-Z (Mac).