Default font in Impress

hello every one
i am trying to make presentation via impress and every time i switch from arabic to english and i come back to type in arabic again the font changes

i know this topic was answered before but non of the solution worked for me it keep switching to tahoma how can i fix that?
thanks a lot

Could you please edit into your question the specifics about what “solutions” you have attempted that have not worked? That would prevent people giving you an answer you have already tried. You should also tell us (1) what version of LibreOffice you’re using; and (2) what platform you’re on (Win? OSX? Linux?) Thanks.