In order to hide root from an application, you need to use a Xposed/Edxposed module called RootCloak.

1. Install Xposed/Edxposed framework

See How to install and use Xposed/Edxposed with Genymotion Device image (PaaS)?

2. Install RootCloak module

Installation

1. Launch Xposed Installer or Edxposed manager and go to the Download section:
   
2. In the search field, type "Rootcloak" and click on "Rootcloak (with 5.x and 6.x support)"
   
3. Go to the Version subsection and click on Download:
   
4. After download, you will need to authorize Rootcloak module installation:
   
   
5. Go back and click on Install:
   
6. Once installed, you will still need to activate Rootcloak module. Go to the Modules section:
   
   Activate Rootcloak module.
   
7. Reboot the instance. Do not reboot from Xposed installer or Edxposed manager: this will freeze the instance.
8. After reboot, launch RootCloak application.

Usage

1. Select Add/Remove Apps.
   
2. If your app is not in the list, you must then click the "+" sign to add it.
   
3. Exit RootCloak settings. If the app you just added to the list was already running, you need to FORCE CLOSE it for the settings to take effect.
4. Run your application.

For more details on how to use RootCloak, please visit https://github.com/devadvance/rootcloak.