In one document I switched into "block mode" and I tried replace couple strings separated by space. In result I got 0 changes. STEPS TO REPRODUCE 1. open any text document 2. switch into "block mode" 3. invoke replace 4. in "Find" field enter two words separated by space 5. In Replace enter whatever you want or left empty OBSERVED RESULT "0 replacements made" EXPECTED RESULT "X replacements made" where "X" is number of occurrences for given string SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.24.3 KDE Frameworks Version: 5.92 Qt Version: 5.15.3 with recent KDE patches ADDITIONAL INFORMATION Note please we could avoid this issue when "block mode" was available only in moment some keys combination holding, i.e.: Alt+Shift like it happens in Notepad++ (or Alt+Left Mouse Button). IMO or looking on my experience with Notepad++, this is much more useful invoking this function than switching on/of by Ctrl+Shift+B.