EDIT: I think I misunderstood something but maybe this is interesting after all? 
You can use Kanvas Buddy.
If you install the plugin Kanvas Buddy then you get a very comfortable solution to almost not need the disturbing Dockers, so you can stay mostly in canvas only mode and use all the space your display offers! And if you need to access your layers, then call it.
This plugin can be shown on the canvas via a shortcut, and it provides you with different tools, you have a configurable selection that you even can extend with little scripting or programming knowledge (I myself love Kanvas Buddy).
Another nice plugin is the Krita UI Redesign Plugin described here.
I like this plugin so much, because even in canvas only mode, which is accessible with the tab key, you have the tools you have just enlarged available and the Tool Options Docker as well, and can show and hide them at will, you no longer have to leave the canvas to access it. So, no longer back and forth!
Kanvas Buddy’s version patched by @Halcyoen for Krita 5.x can be downloaded from his GitHub project page, here is the direct download link, in this ZIP file you will find the file “kb-0-5-unofficial.zip” where the plugin is located, it’s handled a bit unfortunate 
but works fine.
This is the GitHub project page of the Krita UI redesign plugin, I’m using the 0.5 alpha version direct download, if an alpha is too insecure you could use version 0.2 download with this instead.
Here you can see Krita in Canvas only mode with KanvasBuddy in the middle (with nearly every option enabled) & the Krita UI-ReDesign-Plugin which allows showing the Toolbox & the Tool Options Docker (and both can be hidden)
Michelist
Addendum: The easiest way to install plugins in Krita is to go to “Tools” >> “Scripts” >> “Import Python Plugin from File…”, then in the dialog that opens, specify the path to the plugin (the ZIP files you just downloaded) and confirm it, confirm the next dialog box as well, then restart Krita and then, depending on the plugin, set up the plugin to your liking.