Select the target folder in the Workspace panel to save the new file.

Click on the toolbar;

Or, go to File → New from the top menu;

Or, right-click the folder to which you want to add the new file, and click New.

Select a file type from the drop-down menu.

Click on the toolbar;

Or, go to File → Save As... from the top menu;

Or, press Ctrl+S keys.

Type the name of the new file in the Save file as form.

Click Yes to accept creating the new file.