Make a Campaign active/inactive
To make a Campaign active or inactive, click on the Marketing tab on the left, and then click on Campaigns.
You will see all of your Campaigns listed in the Campaigns table. Note that you can sort the Campaigns table by clicking on the column names.
The far right column is titled "Actions". Under this column you will see the options Edit and Delete. Click on Edit. You will be shown the Edit Campaign screen which has the fields Name, Cost, and Lead Value. Under those fields, click the "Campaign is currently active" checkbox to make it active and uncheck it to make that Campaign inactive.