PlayerXtreme enables you to loop multiple videos by following the steps given below:
Step 1: Tap on the "select" option from the three dotted line at the top right in library to select multiple files you want to play.
Step 2: Tap on "Play " to play multiple files from your library.
Step 3: Play your selected videos and tap once on "Repeat" option at the right side of the bottom bar to repeat your entire video selection.
Step 4: Double tap on the repeat option in the bottom bar to repeat a track forever.