One checkbox in Solo centres the login, register and password-reset forms and drops both sidebars from those three pages. This video shows where it is and exactly what it changes.
The setting
Open Solo's theme settings, expand Global Site Settings and choose the Interface Behavior tab. The checkbox reads Tick this box to modify the layout for the login, register, and password reset pages, and its description is accurate: the form is centred and the left and right sides are concealed.
What actually happens
When the box is ticked, Solo compares the current path on every request. On a match it removes the first and second sidebar regions from the page render array and attaches a small stylesheet that centres the form. Because the regions are removed rather than hidden with CSS, the blocks in them are not rendered at all on those pages — there is no hidden markup left behind for a screen reader or a crawler to walk through.
The three paths, and the one it does not cover
/user/login/user/register/user/password
Those three literal paths are what the code tests. The one-time login link that arrives by email lands on /user/reset/…, which is not in that list, so that page keeps its sidebars. Worth knowing before you promise a client a uniformly minimal account journey. Anything you have placed in a region other than the two sidebars — a header block, a bottom container, the footer — is untouched and still renders.
When to leave it off
If your sidebars carry something a signed-out visitor needs on the login page — support contact details, a language switcher, a “request an account” block — centring the form takes those away with it. Move that content into a region the setting does not strip first, then tick the box. The feature is built into the theme, needs no module, and runs on every core version Solo supports: ^10.1 || ^11 || ^12. See the Solo theme page, or why Solo suits sites with no developer on hand.
If this is one piece of a bigger build, Drupal architecture services is where that conversation starts — or get in touch.
