How to enter space in formula

I wrote a formula in writer. I want to enter space on the left and right of the equal sign. How can I do that? I tried from entering it from bottom on the screen that came when I clicked on the formula, it does it there but then when i go back to normal writing mode the space i entered is not there.

Enter ~ for a large gap or ` for a small gap. As an aid, select Formats in the Elements pane and hover over icons to see the tooltip.

Help is also quite useful, Format

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Just for clarification - screenshot
image

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