It is possible to collapse/expand groups of tags such as divs, ul, etc. This options allows to determine which way the code folding should be presented like.<br/><br/><b>Manual</b>: No arrows next to the line will be shown, you can collapse/expand only via keyboard shortcut.<br/><br/><b>Mark Begin</b>: an arrow pointing down will appear next to the line, at the start of the code that is possible to collapse/expand.<br/><br/><b>Mark Begin and End</b>: like Mark Begin but an arrow pointing up will be shown also at the end of the collapsible/expandable code bit.