Whenever I add new components or modify something The companion app forcely closed.
In the companion app, if you press the 
(Square button at the bottom to switch between apps), your companion disconnects.
Just check this out it might help.
How to fix the companion crash issue.
- Make sure the devices are connected to wi-fi.
- Ensure there are no faults in the blocks. If you are not sure, search the problem in the community, try solving the problem yourself if neither of them works, follow the community guidelines and post your question on the community.
- Ensure the file size is as a .apk file is less.
- Try minimizing the number of screens
- Ensure the kodular companion is updated.
Update kodular companion app