Add more multiwindow apps on your Galaxy phone or tablet.
NOTE I: This app requires a ROOTED device. If you don't know what rooted is, then more likely your device is not rooted so please don't install if you are not sure if you have a rooted device.
NOTE II: This app only adds apps you select into the multiwindow app list and has nothing to do with how multiwindow function works. It seems that in EDIT mode, that is when you are adding apps from the edit list to the traybar, the wrong app is being added. This is because Samsung did not make the multiwindow edit list to support more than 32 apps at the same time. This is a shortcoming in the part of the samsung multiwindow code and has nothing to do with this app.
NOTE III: Just because you can add more apps in the Multiwindow traybar does not mean you have to add all your apps. Based on experience, not all apps are multiwindow-friendly and adding too many apps causes the multiwindow traybar to lag or slow down so BE WARNED.
COMPATIBLE DEVICES:
Galaxy S5 and variants
Galaxy Note 3 and variants
Galaxy S4 and variants
Galaxy Mega
Galaxy Grand Duos
Galaxy Tab Pro 8.4, 10.1, 12.2
Galaxy Note 12.2
Galaxy Note 10.1
Galaxy Note 10.1 (2014)
Galaxy Note 8
Galaxy Tab 8
Galaxy Note 2 (with JB 4.3 only)
Galaxy Note 1 (only those using X-ROM, N8XT & N1XT ROMs)