Yes, you can change the font size in LG Q6 Plus.
LG Q6 Plus dimensions are 142.5 x 69.3 x 8.1 mm (W x H x D).
No. LG Q6 Plus does not have the fingerprint scanner but it comes with advance level face recognition.
LG Q6 Plus has 3000 mAh Li-Ion battery which offers talk time of about 16 hours and standby time of about 200 hours.