1. Delete the contents of unused tabs in the layout. Select the contents of the tab, right-click and select Delete.

2. Click OK in the pop-up window.

3. Next, enter the "PU" command in the command bar, and then press Enter or space.

4. After checking the position shown in the figure below, click the "Clean All (a)" button.

5. Click Clean All Items (a). Don't worry about your CAD drawing, because all the cleaned objects are not used in the current drawing. )

6. Click the "Close" button to save the current drawing. You will find that the file has become smaller.