ATB Coin, this is your fault. This is bug.
I had conversation in Slack.

First of all, how to know, whether Staking is enabled or not ?
In wallet: Menu:  Help -> Debug window.
Then in command line at the bottom of opened window, one should type following command: getstakinginfo and press Enter.

Below information will appear.

{
"enabled": true,
"staking": false,
"errors": "",
"currentblocksize": 1000,
"currentblocktx": 0,
"pooledtx": 0,
"difficulty": 1.52587890625e-005,
"search-interval": 1,
"weight": 13407943902,
"netstakeweight": 280688114116540,
"expectedtime": 3140169
}

Please, note, that this information DOES NOT show relevant status.
Even if "staking": false, it maybe, that staking is working.

Person in slack, writing under "atbcoinsupport" nickname, wrote following:
soon a new wallet will be released with the addition of a mining inclusion button

Please, also note, that person in slack, writing under "atbcoinsupport" nickname, is much more adequate, than one is sitting here. In this forum ATB support person cannot answer simplest questions, "plays stupid", repeats the same phrases and so on.