where to set label on the left as below:

Duplicate, this is part of WIP https://github.com/ocornut/imgui/issues/395
But trust me, it is a fake good-idea.
Right now you can work-around it by using Text, SameLine, Widget("##hidelabel", ..);
There's one problem with SameLine: the label won't be centered vertically :(
@Alan-FGR AlignTextToFramePadding() does the job for now.
@rationalcoder i'll give that a try. thank you :+1:
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@Alan-FGR AlignTextToFramePadding() does the job for now.