@guy038 said: Now if, for any font, you select all the text of that new tab and run an Edit > Line Operations > Split Lines operation, for most of them, indeed, the spliting behaviour occured right after the 78 capital letter P. However, for eample : For the proportional Times New Roman font, the spliting action occured after 76 letters P For the fixed witdh **``Consolas font, the spliting action occured after 77 letters P The explanation may lie in something I discovered while bug-hunting in the Elastic tabstops function of Columns++: when DirectWrite is in use, the width of characters can work out to fractional pixels (this is true for both fixed and proportional fonts); but Scintilla only reports the width of strings as integers. So due to the effect of rounding to integers, the width of a string of 78 letters P is not necessarily 78 times the (reported) width of one letter P. Notepad++ uses 78 times the width of one letter P. (Not that it matters much, since none of this is likely to be what anyone wants or expects anyway.)

@fml2 , old (collapse) the structure while I’m at its closing element. How can I quickly do this? View > Fold Current Level (Ctrl+Alt+F) (use the shifted version to unfold, or checkmark Settings > Preferences > Editing 1 > ☑ Make current level folding/unfolding commands toggleable to make it a toggle, so the same keystroke folds and unfolds the current level). This will work whether it’s XML or HTML or JSON or anything else with folding. Even though it has “level” in the name, it only does it for the current group, so in <one> <two> <three/> </two> <anotherTwo> <anotherThree/> </a|notherTwo> </one> if the caret is at the | in </a|notherTwo>, it will only collapse <anotherTwo>...</anotherTwo>, not anything at level 2. To answer your subquestion, though it’s not as important, there is also a way to: quickly navigate to the matching start element and fold from there. @rdipardo’s “HTML Tag” plugin has the Plugins > HTML Tag > Find Matching Tag feature (defaults to Alt+T), which does that aspect (even in an XML file, even though the plugin has “HTML” in the name). (You can install the plugin through Plugins > Plugins Admin)