It would be good to have a new feature: to modify the same document having side by side two different pages to take notes from one to another page.
Xodo Pro already has this feature available. See
What about Xodo for Android?
Unfortunately Xodo Android does not have Side-by-Side available at this time. Depending on your device, such as some Samsung Tablets, you may have a device-based option for Split Screen View, but that will depend on your device, not Xodo.
That said we do have a Suggestions Forum available here;
|Suggest a new Feature|
If you have the time please stop by to post and vote on ideas you are interested in.
Samsung tablets do have this feature, but it's not possible to open the same app twice.