Your slider is reflective of the amount of Mvests you have. The equation is not readily available for me currently but it's close to a 1:1 for Steem Power but not quite. Currently it seems 510sp ish is what is needed for 1 Mvest that will give you a slider.

Exploring the 'balances' tab on http://www.steemworld.org/@omra-sky can give you a better idea of the SP needed to get 1 Mvest for the coveted slider.