[Q] Subtitles problem topic

Well. I'm a bit an anime fan. I tried watching an mkv video on my new tablet but it doesn't show any subtitles. There's a label beside the video SSA and I know it is within the video not a separate file. I tried searching for a fix but no luck. When I tried to view it in VLC, the subtitles show up.

How can I enable it or something? I'm kinda new to MX player.