I see people accidentally spend coins like me..
A panel can pop-up to screen to ask us one more time that we are sure about spending coins..
This can be applied to entering coin games too..
Also some of players may dont want this feature then they should be able to turn off that.

P.S :Sorry if this idea posted in suggestions before i couldn't find it.

^^^^^^^^

What coins have you accidentally spent? There are lots of different ways to check if you're about to spend coins; it's your responsibility to check.
For example:
Coin games have very clear icons in the game title
Coin tournaments very specifically tell you the entry fee
Quickmatch has a slider for the amount of coins you're willing to spend on a game
Buying anything (colors, strategy pack, map pack, membership, etc.) all state their price in advance
Power-ups in Idle state their prices before you buy them
Buying coins gives you the exact prices

I'm not sure how you'd accidentally spend coins, unless you didn't read carefully enough. It might happen, of course, but you are very much notified when a coin transaction is going to happen.

I think this is meant for the idle forum and not the classic forum.

For the coin games/tourneys, perhaps a new setting could be introduced like the Settings Highlight, that displays a popup box asking for confirmation if a player joins a game with an entry fee over X coins. Some player might want X to be 0, while others might want it to be 999999999, so that way people can decide for themselves if they would want a warning before joining coin games.

As for the forum itself, its mostly about the powers and artifacts in idle, since they dont have a confirm button either

I think this is meant for the idle forum and not the classic forum.

I meant for both of them, coins are the same coins with Idle and Classic...
But i needed to choose one of them.

Yeah I know everything is clearly labelled, but in Idle I could definitely see myself buying a power by accidentally pressing a button on mobile.