You can't. Qlik Sense automatically adjusts the width depending on screen size and number of values. When you have too many values to display at one time you get the slider to scroll up and down the data.
With that many values you will have the same issue with any visualization that you pick.
Nothing I can think of. Even if you could display all 50 values I don't think that would be very user friendly unless you had it up on a 65 inch or larger TV screen. If you tried to print it I don't think you would be able to read most of the values.
So if scrolling doesn't work for you then I don't know what you can do.