I imagine that you are using a C3D Note for your label. There are many possible reasons for the text saize not changing, but I can tell from your screenshot that the scale of your draing is likely one reason that the texct is so large if this is a C3D note type label. Otherwise, make sure that when you change the text size that you also change the text size on the dragged state tab.
yes, it changes. thank you.. but may be there is even more way.. 
Remember that all Civil labels are in absolute size e.g. 3mm so they will be very large (relatively speaking) in a drawing at 1:10000 compared with a 1:100 drawing
AEC Collection 2025 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
64Gb RAM Intel(R) Xeon(R) W-11855M CPU @ 3.2GHz
NVIDIA RTX A5000 16Gb, Dual 27" Monitor, Dell Inspiron 7760
neilyj (No connection with Autodesk other than using the products in the real world)
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AEC Collection 2025 UKIE (mainly Civil 3D UKIE and IW)
Win 11 Pro x64, 1Tb Primary SSD, 1Tb Secondary SSD
64Gb RAM Intel(R) Xeon(R) W-11855M CPU @ 3.2GHz
NVIDIA RTX A5000 16Gb, Dual 27" Monitor, Dell Inspiron 7760
I didn't really explain it very well. In the label style editor, the place where you changed the text size was most likely on the layout tab. Check the dragged state tab to make sure that the text size there is also what you want it to be as that size can be different than the default text size
o.k I understand that that it is very large. this means that there is not other way to change size? 
wow... thank you kirknoonan.. I am looking for the whole day.. thanks...