If you are referring to Lightroom Mobile, the size in pixels (width and height) of the files available to Lightroom Mobile is constrained by the software and you cannot obtain larger size images for Lightroom Mobile to use.
Thank you very much, so I can not use Lightroom to the cloud and allow friends and Family to downoad them in good Quality Format??
I guess that depends on what you mean by "good Quality Format". It also depends on what the friends and family want to do with these photos.
I don't remember exactly what the limits are for pixel dimensions in Lightroom Mobile (I'm sure someone else will jump in and clear this up), but depending on the answers to all of these things, maybe Lightroom Mobile is good enough quality, and maybe it isn't.
Are you asking how to enable downloads? I'll assume you know you have to do this via LrWeb in your browser and in the Share's options.
Note that the other person will need to have an Adobe account to download a JPEG, so maybe set up a second Adobe account for yourself (you'll need a different email address) and give them the details.
The JPEG downloads are 2048 pixels long side - you can't change this.