1. Right-click on the timer > "Edit Layout" 
2. Click on the plus sign at the left > List > "Splits"
3. Press "OK"
4. Right-click on the splits/timer > "Save Layout" (just so you don't lose it)
5. Right-click on the splits/timer > "Edit Splits"
6. Add segments to your heart's content
7. Right-click on the splits/timer > "Save Splits" (just so you don't lose them)

@MrMonsh I don’t think you understood what he was asking. To my understanding he meant that he already made splits but it only shows a timer.

To fix this, simply right click on the timer and click “Open Splits”. If you ever want your splits to not show and just a timer, right click again and hit “Close Splits”.

From what I understood, it seemed like he removed the Splits component while editing the Layout, but I admit your case is just as likely.