Don't worry my brother, you can still read offline. HOWEVER...
If your app is on latest version, I'm sorry to tell you the bad news - you have to manually download the stories ONE BY ONE, unlike the previous version(s) where you can multiple pick the stories you want to download. If you try to pick/check stories, only one button named 'Remove' is you can see and the button 'Download' is now gone.
The pro in this version is you can finally download manhua/comics which explains well since they're unavailable in the previous versions. IN MY OPINION, I rather found this useless since manhua will ate a lot of size like you’ve downloaded a 30-mins 1080p video. Worse, you can't delete the files as they are encrypted to numbers and there's no way to know which is which.