I currently have the android version installed on a phone and on a Samsung tablet. The display on the phone shows just the subject lines of the emails which is fine for me however on the tablet the display is vertically split which make the subject line so short that many times you can’t tell what the email is about. I can find nothing on changing the display in the android version.
I don’t know if this will help, but try going to “Menu / Settings / Mail / Read” and try adjusting the “Message Preview Lines” at the bottom, where you can adjust that up to 3 lines for the Subject.
Or maybe try adjust the Android Tablet OS display resolution via “Settings / Display / Screen Resolution” where there is usually 3 different resolutions you can set depending on the model.
There is also eg: Tablet OS Display “Zoom options” you can try adjusting & see if that does anything.
Apart from that, you might need to wait for the next Android eM Client build & try that, which hopefully won’t be far away.