MainWP Dashboard 6.4.2-rc.2

Added: Optional delays to spread scheduled Built-In Backups task starts over a configurable time window.
Added: Optional Manage Sites column showing abandoned plugin and theme counts.
Added: Support for disabling site screenshot previews across the Dashboard.
Added: Support for custom Dashboard download URLs when wp-admin access is restricted.
Fixed: Selected sites are now preserved when switching selection tabs while editing Built-In Backups tasks.
Fixed: Large Built-In Backups downloads now use smaller parts to avoid server response-size limits.
Updated: Improved Built-In Backups error readability, added requirements guidance, and clarified folder locations in error messages.
Updated: New remote backup folders now include site names for easier identification.
Updated: Upgraded the Dashboard widget layout library to GridStack 14.1.0.