You can manage the columns of your row by splitting up your row into columns and customize each column individually.

Just follow the steps mentioned below to manage the columns of the row
1. Open Row Action Bar using  icon.
2. Click on Column . 3. Select the desired column layout for your row.
Note:
If you decrease the number of columns in the active row then the components in the eliminated column will automatically be placed in the first column.
The example mentioned below will help you understand better.
Suppose your row has 4 columns in the beginning. And you changed it to a 3-column row.
Then the components present in the last column will be moved to the first column. Please read the confirmation box before proceeding.