There are 3 ways to empty Recycle Bin in Windows 10:
Option 1: Empty it in its Manage menu.
Step 1: Open Recycle Bin, click Manage on the menu bar and choose Empty Recycle Bin.
Option 2: Clean Recycle Bin in its Context Menu.
Step 1: Right click Recycle Bin, and select Empty Recycle Bin in the menu.
Option 3: Empty it in Settings.
Step 1: Access Settings.
Step 2: Choose System to continue.
Step 3: Open Storage, and select This PC (or a hard drive) under Storage.
Step 4: Click Temporary files and recycle bin.
Step 5: Choose Empty recycle bin and click Delete.