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User mentioned (1): @JanBína
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I have found a smooth solution, thanks to @JanBína, using Size.Exact

class AppWidget : GlanceAppWidget() {

override val sizeMode = SizeMode.Exact

override suspend fun provideGlance(context: Context, id: GlanceId) {
    provideContent {
        MyContent(context)
    }
}

@Composable
private fun MyContent(context: Context) {
    val size = LocalSize.current

    Log.d("WidgetContent", "Size: $size")
    
    WidgetContent()
}
}

Log while resizing the widget:

WidgetContent D Size: 160.0.dp x 176.0.dp

WidgetContent D Size: 248.0.dp x 176.0.dp

WidgetContent D Size: 336.0.dp x 176.0.dp

WidgetContent D Size: 336.0.dp x 272.0.dp

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