The work around is very simple. You will remove the default Activities section, and then replace it with a new Activities section. This new Activities section will have more configuration options.
1.) Go to the entity you wish to edit and click … (More Commands) > Form.
2.) Click on the Activities section, then click Remove.
3.) Click Insert > Notes.
4.) Double click the Notes section you just added to open Activities Tab Properties.
5.) Click the Formatting tab and choose your formatting preferences.
You can now control the whole layout. You can configure the number of rows, and you can set the section to automatically expand to use available space. You can make the social pane shorter or longer to fit your needs.
6.) Click OK, then Save and Publish.