New sliding shower doors are installed but leak water on floor?

Doors are level, but apparently tub slopes toward the drain side so water escapes along the bottom of door near the drain. There seems to be about 1/2 to 1 inch opening along the bottom, creating a gap below the door nearest the shower controls.. How do i close that gap without having the shower doors taken down because they are drilled into a slate type ceramic? When i shower, the bathroom floor is soaked with water flowing out if that space. Doors are the new frameless type and a well known expensive brand. Any suggestions appreciated.

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