Already solved.
It would be better if Header.TextAlignment could be set on the Grid Editor.

TeeGrid Version: 1.14
windows10 64bit
Lazarus3.0/FPC3.2.2


Steps to reproduce：

Select Columns tab - Select a column - Header - UnCheck Parent Format - Text Align, CANNOT Change the Horizontal property.
Is it a Bug? or I made sth mistake?

Best Regard.