How to resize Equalition Formula in Writer?

Unable to Drag the formula box thus make unale to resize, either edit the formula font format

And one more, how to insert space in Formula?

I have Libreoffice 5.1.4 (latest when i posting it)

To resize a formula, double click on it. Then, from the menu, choose Format > Font Size > Change “Base size”.

To insert spaces, put them in a quote like this: " ".

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You can insert a narrow space with ` and a wide space with ~. http://wiki.services.openoffice.org/wiki/Documentation/OOoAuthors_User_Manual/Writer_Guide/Math_commands_-_Reference lists all commands in Math.