5 ways Of customizing the editor

1) By right clicking the empty space on the top toolbars, you can turn them on and off to make them visible or to go away.

2) selecting the title of windows in the user interface, such as the RollupBar and the Console, you can drag it around your window that best suits your preference of its location within the user interface.

3) Go to Tools > Preferences. This allows you to choose what you want on and off in the game and what you prefer to see.

4)The Configure User Commands option within the Tools tab allows you to create a panel where you can select keys that you use the most and can be placed anywhere in the user interface for your convenience of accessing these tools. After you have finished customising the tools you want for the panel, go to Tools>User Commands>the name you gave your panel which then you can drag into your viewport.

5) to attach a panel to the sides of the editor, such as a material editor,  is done by selecting the material editor and dragging and dropping onto the desired side of the screen and then customizing the size of the panel so it is not just floating in the centre of the screen obstructing views of the level.