pcmanfm-qt is a QT port of PCManFM that is the default file manager for the LXQR desktop.
Ranked in these QuestionsQuestion Ranking
Pro Can open folder as root
PCManFM can open different folders as root, this way you don't have to use the terminal to move around files for which you need root permission.
PCManFM is a very lightweight and simple file manager.
Pro Has a lot of features
... that only Dolphin, Krusader, Nemo & Nautilus has onboard -
but this one is a small footprint reliable friend.
Con Some operations are slow
Because it tries to be as lightweight as possible and tries to use very little RAM. This can unfortunately lead to it being slow sometimes.