Hi.
The Kanban framework needs the limitation of WIP in order to be applied so that teams can achieve amazing results.
The WIP limit sets the maximum number of cards a Column or Lane can have. This is how the workflow is managed.
There are 2 ways to implement it, the first one is that if the limit has already been reached, it does not allow to add another card. The second is that if the limit is exceeded, the column is marked with an eye-catching background or in some other way to indicate that the limit has been exceeded.
It would be the same for the lanes.
Also, if a column is subdivided into ‘Doing’ and ‘Done’, ideally the WIP limit should be at the global column level and affect all the cards between the 2 sub-columns.