hello,
is there any option to change a layout of a dashboard that I missed? maybe a Kibana plugin?
I would like to rearrange the dashboard: putting 3 visualization in a row, setting a visualization height etc (without drag the border of the panel)
The only way to do this is to drag/move/resize the panels of each visualization. There isn't an "auto layout" feature where you can specify rows/columns at this point. I'm not aware of any plugins to accomplish this.
Can you elaborate on your use-case? Is the current process too tedious?
I have Dashboard with lots of gauges, and thought I can set their height and width at once.
not that urgent 
btw, is there an api for that?
Ah, I understand! We don't expose an API for this specific functionality.
If you want, feel free to open an enhancement request here asking for an easier way to adjust dashboard layouts