Apparently Format > Header Color action button doesn’t work recently. Is this a bug?
Hi Takanori,
Welcome to the forums!
You’re correct. This currently seems broken. I’m writing up a bug report for the engineering team to get it fixed as soon as possible.
This has been reported and logged as SG-15045.
Hi Bouchep,
Okay 
We’ll wait for the support. Thank you.
Hi @kishikawa_takanori,
Just dropping in to let you know that this bug was fixed up in the 8.8.0.3092 release.
Cheers,
Shayna
Hi @shaynad,
Thank you for your suport ! I checked it