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?