I misunderstood - You said “white movements” which, to me, implied the blank parts of a standard engraving, not the travel moves between parts.
What you’re referring to is your idle speed, controlled by the configuration of the laser itself. LightBurn never changes your idle speed, intentionally, so you set it in a couple of ways:
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Change the setting in the controller. https://github.com/gnea/grbl/wiki/Grbl-v1.1-Configuration#110-111-and-112--xyz-max-rate-mmmin The Max Rate and Acceleration settings set the maximum speed the controller can move, and how fast it accelerates to speed. Lowering one or both of these values will reduce the amount of shake you’re getting.
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Change the G0 feed rate with a macro. Use a command like G0 F3000 to set the speed of G0 moves. LightBurn never overrides this, so it will stick. The F parameter is in mm/min, so 6000 is 100mm/min.