When using galaxy S4, I could create a folder in the app drawer. But after I changed my phone to galaxy A3, I couldn't find any menu to create a folder in the app drawer. How can I do that in galaxy A3? Thanks before in advance.
The creation of folders depends on the launcher. If you can't simply drop one icon on top of another (a folder would be created with two icons inside), try changing launcher.
Go launcher gives you the option of adding folders on the app drawer, so give it a go. The downside is that go launcher on the last years has been supported by ads. Give it a go and see if it's too much or if it's bearable.
Nova launcher is a good option (low on resources and plenty of customization) (you can add drawer folders and tabs with prime, I don't know how much but not a free solution)
Both are two good and stable launchers that have been evolving for a couple of years now. See which one suits you best.