Go to Theme Options -> Page to manage default settings for default page layout and sidebar.
The similar way as for single posts, you can edit these options for each particular page separately.
Page layout
Watch an example in this short video:
Page sidebar
Just as for each post, you can set specific sidebar for each page.
Watch an example in this short video:
More about sidebars is described in Sidebars sections of this documentation.
Full width (blank) page template
There is another page template provided in this theme which may be useful in some cases. As shown in the image below, you can select the blank template which will only display your content, without sidebar and in a full website width.
Authors page template
The authors page template is provided since version 1.2 and you can use it to display all your website users ( authors ) on a single page. As described on image below, you just need to select the Author template and follow its options. Also, the authors page template is fully compatible with all default page layouts that Gridlove theme offers.