How can I remove this ?

[worthy ivy]

How do I remove the Unnamed Marker ?

[stiff token]

fly to its center
left click the white square which you might not see because of shaders
press delete on your keyboard

[worthy ivy]

But its a particul that go in the air and generating

[stiff token]

is it your datapack?

[worthy ivy]

A mod I think

[stiff token]

builder mode > context menu > tool box > show marker gizmos > false