There are multiple ways to delete a task in Float.
From the task menu:
Click Actions > Delete to remove the selected task.
From the project menu:
Select the Tasks tab, find the task you want to delete, and click the "X" icon to confirm. This will delete all instances of that task from the Schedule.
From the Schedule:
Right-click anywhere to bring up the menu, select Delete, and quickly blast unwanted tasks into oblivion.
💡 Here's a tip: If you've accidentally moved, added, updated, or deleted a task from the Schedule, you can undo the last action/s using Ctrl-Z (PC) or Command-Z (Mac). Note: Undo is not supported for replace actions.