you can declare a field (e.g VISIBLE) in your section access logic table having values like 0 or 1 per user.
And then on UI you can control the visibility of Button or any UI objects by applying layout condition based on the field value per user. Suppose an UI object is set to be visible when VISIBLE field has a value as 0 then any users who has the field VISIBLE's value as 0 only those users will be able to see the object in the Dashboard.
To control the visibility from objects and/or data like sudeepkm mentioned is possible but it's more a comfort feature for a certain usability but it's not section access for real confidental data. The reason is section access worked by opening the application and all data which won't be removed in this step might be further accessable.
