In PDFelement for Mac, it's effortless to delete pages from PDF files.
Open one file and click the "Organize Page" button on the top left.
In the pop-up window, click the "Delete" button. Click a single page or hold the Command key to select multiple pages at the same time, or select the "Page Range" in the right-side panel.
Click the "Delete" button or press the Delete key on your keyboard to remove the selected pages.
Alternatively, you can go to the Thumbnail Panel, right-click a page you want to remove, and select the "Delete" option in the drop-down menu.