You probably have checked (=selected) "Always start in full screen mode".
In "Options"/"Preferences"/"Video" deselect "Always start in full ..."
Then close and exit BSPlayer and try again.
Result?
Probablement vous avez selectionn?? "Plein ??cran".
Sous "Options"/ "Pr??f??rences"/"Video" d??selectionnez "Plein ??cran"
Alors fermez et quittez BSPlayer et essayez de nouveau.
Le r??sultat?