It is really a feature of the launcher Bliss.
If you just let the icons go where they fall and never move them you will have no problems.
If that doesn’t suit just install another launcher. I have been happy with Lawnchair2 or search for one that suits.
Be aware of Settings > Apps and notifications > Default apps. There you find Home screen. Once you have more than one launcher they will all appear here and you can select your test launcher or return to Bliss.