Hi Cosmin. Welcome to the Hueman forum. The theme is designed using fixed-width sidebars and doesn’t currently include an option to change (or switch) them. It can most likely be accomplished but would take some amount of coding. Here are a couple of related posts that might give you an idea of what’s involved:
https://ww.wp.xz.cn/support/topic/switching-sidebar-sides?replies=9
https://ww.wp.xz.cn/support/topic/how-to-change-sidebar-positions?replies=6