How to open multiple documents in several tabsWith PDF Pro you can open multiple documents at the same time in different tabs.Open the first document you want.Tap on the More button. Tap on the Add Documents button. Select the desired document. To switch between the tabs, just tap on the tab you want to open, as indicated in the screenshot below. Open the first document you want.Tap on the Add Documents button. Select the desired document. To switch between the tabs, just tap on the tab you want to open, as indicated in the screenshot below.