I remember android has disabled app exporting to SD card since i dont remember which version, but a person has showed me his 7.0 or 7.4 LG which actually is able to move apps to SD card. Why is this happening and how can i do the same at 7.0 androd? Preferably, without having to format SD card as internal storage
I'm not sure about formatting as internal storage, if your device can read it, it's already formatted for Android, and can be used as either internal or external... just switch it.
Also, some applications don't allow moving the app for compatibility and security reasons, it's not always device dependent.
Try scrolling through the apps and see if you can move any of them across.