Have you tried Settings/chats and calls/text size...?
The font size of the chats cannot be changed from the Text Size settings in WhatsApp.
OS: Windows 10 build 10586.36. Handset: Lumia 640 Dual SIM
Then it's a bug of the build. I don't know when they are gonna release a smooth build. It's been a long time!
Same bug here. And after reseting an upgraded phone. Already tried to delete the app and didnt work.
I've been waiting, and even after the update they still haven't fixed it.Same bug here. And after reseting an upgraded phone. Already tried to delete the app and didnt work.
I am facing the same problem in whatsapp. The font size got bigger by itself and i have tried everything;from restarting, text size increase and decrease both in phone n app. Nothing seems to work. My phone is Windows 535, And it is Windows 8.1software.
all of a sudden this has happened and I have never experienced such a problem before. I wonder it resolves soon.