To change the amount of space Recycle Bin can use before deleting files completely, use these steps:

1. Use the "Windows key + D" keyboard shortcut to see the desktop icons (if applicable).

2. Right-click the Recycle Bin icon and select the Properties option.

3. Select the Local Disk (C:) location.

4. Choose the Custom size option.

5. Use the Maximum size setting to specify the amount of space the Recycle Bin should use in megabytes.

6. Click the Apply button.

7. Click the OK button.

Once you complete the steps, the Recycle Bin will store deleted files until they reach the maximum capacity you specify. Then, it will start permanently deleting files from the oldest to the newest.