Hi,
1) You can add the button filled with color effect from left to right by using the custom Css, at TemplateToaster -> General -> Css.
2) and 3) Please elaborate it with some example, that will be more convenient.
4) You can delete the particular cell in the content, at TemplateToaster -> Content -> Select the Cell you want to delete -> Cell -> click on the (-) icon to delete it.
Do the same for row under Content -> row section.
If you want to delete some other section than please specify it.