A special form of bar lines are bar lines with repeating dots at one or both sides. Bar line-repeats should always be paired with one exception for the first repeat at the start of a melody, where it is very uncommon to write down the repeating dots at the (missing) first bar line. Prima volta and secunda volta signs may be used in conjunction with bar lines having repeat-dots.
To change the appearance of a bar line you can use <\> repeatedly. It will change the bar line from single, to double, opening and closing bar lines.
Similarly, you can toggle the repeating dots from left to double, right and none using <;>