If you use more swim lanes in activity diagram, there will be rendered a big white space in the first swim lane in the same size as the activity flow paths from the other swim lanes (example below ...)
screenshot:
https://pasteboard.co/I88Eg3T.png
@startuml
skinparam monochrome true
skinparam defaultTextAlignment center
skinparam shadowing false
Title test diagram
|test a|
start
:test test;
:test test;
:test test3;
fork
:test etst;
If (if tdsest) then (yes)
:Inform test;
endif
note right
note
end note
fork again
|test b|
repeat
:testd testre;
If (if testre) then (yes)
:test;
endif
repeat while (further test) is (ja)
fork again
|test b|
repeat
:test test;
If (if test) then (yes)
:iform test;
endif
repeat while (test) is (ja)
fork again
|test c|
repeat
:Etest;
If (test ) then (yes)
:test;
endif
repeat while (further test)
end fork
@enduml