There are 3 ways to empty Recycle Bin in Windows 10:
Way 1: Empty it in its Manage menu.
Open Recycle Bin, click Manage on the menu bar and choose Empty Recycle Bin.
Way 2: Clean Recycle Bin in its Context Menu.
Right-tap Recycle Bin, and select Empty Recycle Bin in the menu.
Way 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 tap Delete.