Hover the SPS token info in-game to see your current Capture Rate
The Capture Rate (CR) displays itself as a percentage. This percentage is an important factor in calculating the SPS earnings of a ranked battle. So playing at a high Capture Rate makes you earn more SPS per battle. The Capture Rate also affects your reward shares (which consist of season points and focus points)
Your CR will deplete 1% per ranked battle, whether you win or lose. The CR regenerates 25% per passing day (= about 1% per hour). The maximum amount of ECR is 100%.
Note: since the update of 7/21/2022 CR now drops 5% per battle if you start a battle at or below 50% CR
Hover the pointed (i) mark after any battle to see your Capture Rate too.