If your camera shows the screen below and it doesn't change, it means that the connection with your phone was not successful .Look at your phone if there is a message that explains the error. If so, correct and reconnect. 

Here's what to do: 

1) Select Disconnect, exit and click OK to confirm the disconnection. 

2) Close and open the device again. 

3) Check if you have the right settings for Exposio in your camera: 

SL2 / EOS 200D camera settings for Exposio

SL3 / EOS 250D camera settings for Exposio

4) Try again the connection steps: 

First steps with the SL2 / EOS 200D Pro Kit - WiFi (iOS)

First steps with the SL3/250D Pro Kit - WiFi (iOS)