Can´t change dpi from 240 to 300dpi when i export in Lightroom Photoshop (Not classic)

Every time i want to export any image i just can´t change 240 to 300 or 72dpi.  The options just doesn´t appear in this version. All images are exported in 240!!!!!

I refuse to believe that i have to make some kind of bridge using Photoshop to do this, considering that this is a so simple thing! 

Anyone can help?