Attribute have disappeared



I noticed that the Gear Icon- to Create New Attribute, that used to be available is no longer seen.
Also, Add New attribute, from the + sign that adds new attribute in the Attribute is now returning with no result, coming with nothing.

This used to be Custom Label attribute, previously I think.

Now I am only limited to what I created previously

Any help available please, I have an urgent requirement to create a board that for work reasons.

Thanks in advance