Otherwise, your doors will be constantly skewed.

After that, you need to take the doors and select the groove at the bottom. At home, this can be done with a chisel. The lower guide roller will ride it. His task is to ensure that the doors do not deviate during movement. Attach the specified video to the floor in a strictly vertical position under the bar. Otherwise, your doors will be constantly skewed. In order to check the verticality of the video, use an ordinary plumb line. After that, put the door leaf into the lower video, and then fix the upper rollers. After making sure that the doors are installed strictly vertically, attach limiters that will not allow the doors to leave for the guide bar.