This might be related to your graphics card.
See this:
Yes I was having this issue before and can confirm having āOutlinerā or āModel Infoā tabs open on heavy models will prevent triple-click selections (This was pretty frustrating to figure out, having to try many things before this conclusion). This is unfortunate because these are really useful tabs to have open on heavy scene files. I hope something can be fixed for this in the future.
This has been an issue for some time. I MUST have outliner and model info open for all the reasons these existing. This is clearly a bug.
I created an account to confirm that this fixed it for me. Thank you!
donāt have this " Edit/Item/Select/All Connected " in ver 2023.
any way i can use triple click to use this function.
Itās on the contextual menu as well, you must select something then right click on the selected object, go to Select/All Connected, I have a shortcut assigned to it since I use it often, I havenāt used triple click in years.