I dont have audio on Fairlight

Hello, i think i erased the Main mix by mistake, i dont now how its happened but, i only can see my bus, i am a begginer in davinci Resolve, and i got this problem that i lost my Main Bus, and i cant hear nothing if i open a new empty project the Fairlight UI remains the same way it dont bring back my main mix controller, its only show the bus. and i can't create a new main mix neither. Please help.

i hope you can help me fast as possible

Resolve 17 enables Flexi Bus mode by default providing more flexible Buss to Buss routing.

With a blank Project prior to using the "Create New Timeline" command, enable the following preference to enable the Fixed Bussing structure of Resolve 16 and prior:
Project Preferences > Fairlight > Audio Busing Mode

This do not resolve my problem, there is no option like that, how do i reset all settings i fairlight to solve my problems?

h ttps://ibb.co/C8ynyLn

see the image, please.