enhance map customization instructions and add warning about size slider behavior

Author: jairomelo

01_make_map.qmd

@@ -143,7 +143,11 @@ From the menu, we can select several categories of symbols. Let's select the `Go
 
 ![](images/Workshop1/Step2/symbology-select-symbol.png){width="90%" fig-align="center"}
 
-To change the size of the symbol, we can use the `Size` slider to reduce it to a more appropriate size. In this case, we're using 5.68 px. Also, select "Adjust size automatically" if you want the symbols to scale as you zoom in and out of the map.
+To change the size of the symbol, we can use the `Size` slider to reduce it to a more appropriate size. First, select "Adjust size automatically" to ensure the symbols to scale as you zoom in and out of the map. Then, you can use a custom size by moving the slider or entering a value; in our case, we selected 5.68 px.
+
+::: {.callout-warning collapse="true" title="Size slider quirk"}
+In ArcGIS Online, every time you select the "Adjust size automatically" option, it will reset the size slider to a default value. So make sure to select your desired size **after** enabling that option.
+:::
 
 ![](images/Workshop1/Step2/symbology-point-size.png){width="90%" fig-align="center"}
 
@@ -183,6 +187,10 @@ Here is the final result of our symbology adjustments:
 
 ![](images/Workshop1/Step2/symbology-final-result.png){width="90%" fig-align="center"}
 
+### Select a better basemap
+
+After adding the layers and customizing their symbology, we have a good, almost ready map
+
 ## Step 3: Annotate the map
 
 In addition to bringing external sources of information into a map (whether in the form of a basemap or additional feature layers), it is common to want to add new information. In many cases it is better to think of the new information as data, and to store it in its own feature layer. We will be describing this approach in the next workshop. For our purposes here, though, we will take the more straightforward approach of simply drawing on the map. The hand-drawn features will appear in what ArcGIS Online calls a "sketch layer."