Map Viewer Label Size

[PWhitten]

We are using Map Viewer in ArcGIS Online.  I assume it is the October 2023 update.  I have turned labels on for a layer and  the labels are appearing with different font sizes.  Which setting can be used to make the font size the same for all labels in a layer?

[RussRoberts]

Under the Labels panel click on Edit label style and you can control the label font type, size, position and halo. Some options will not be shown depending on the geometry type. Sample below is for points. 

If you can also share the map I can take a look at the possible reasons you are seeing some labels appear to be different.