Customize → Category
This is category page eg :Category Demo in here you can setting layout of this page
Click the Blogs Categories.
Sidebar Layout
Left Sidebar.
Full Width.
Right Sidebar.
Please goto Appearance → Widgets → drop drag widget to the sidebar Blogs.
If widget "Newsletter" dont show in the sidebar ,Please goto MailChimp Sign-Up Form → Title → Save.
Top Category Layout
You can setting Top Category layout for yourself
Top Category Layout : Grid Post.
Top Category Layout : Carouse Full.
Top Category Layout : Hidden.
Post Layout
You can setting layout posts for yourself
List Post.
Grid Post.
or you can use post layout with sidebar layout e.g
