Appearance → Widgets
Then click to the Appearance.
We using Blog sidebar for the page : Blog , Single , Search , Author ....
and Sidebar 1, Sidebar 2 for the page :Pages
Because the pages use Visual Composer plugins so you can get sidebar1 or sidebar that you like
We created some widgets , you can drag it to sidebar that you want
Displays featured posts or most views with layout is Grid
2. Most Views
3. Videos Popular
It will show videos : Most Views
4. Slider Posts
It is showing :Featured posts in the layout slider
You can change it when you click to MailChimp for WordPress form settings