With autotools projects, the project tree is displaying many useless symbols discovered in various makefiles. The project tree ends with many symbols like cscope-list, distclean, dvi, html... which are polluting the tree. Since filters are not saved in the kdevelop project file, these need to be done on all platforms where kdevelop is installed for the same project. Plus this is not easy to filter all these dirty symbols: should be block all html files ? all uninstall files ? And what if such files are really inside the project. On Debian Buster, Xfce, with kdevelop 5.3.1 AppImage. This issue is redundant since many versions of kdevelop.
In the Projects tool view, there's the "Show Targets" action in the tool view tool bar. If you disable that one, the targets are hidden. Does this solve the issue for you?
Yes that fixes the issue. Could be closed.