Web maps
A web map draws layers from your organisation's WFS over a basemap, styled the way you choose, for anybody you share it with. It shows your data; nobody can change the data through it.
Making one
On Content, choose Add web map, which opens the Web map designer (it is also on Tools). There, choose New web map, name it, pick a basemap and add layers from your organisation’s WFS. Order them with the arrows (the last one is drawn on top), move the map to where it should start, and Save map. A map is its owner’s: only they and the organisation’s admin can change, share or delete it.
Styling a layer
Click a layer’s name to open its properties beside the map. Every change shows on the map as you make it: the layer’s title, its colour and transparency, the size of points, the width of lines and the outline of polygons, labels from a field, which fields a feature’s pop-up shows and under what names, a filter, and the zoom levels it shows at.
Colouring a layer by a field
Under Style by, choose Categories to give each value of a field its own colour: a condition, a species, a status. The map lists the field’s values, most common first, with how many features hold each. Change a colour or the name the legend shows, untick a value to hide those features, or remove it. Any value not listed is drawn as Other values, and a feature with nothing in the field as No value. Up to 50 values are listed.
If the app already colours the layer by that field, the web map starts from the app’s own colours and says so. Changing them here changes this map only, never the app, and Reset to the app’s styling goes back.
Choose Ranges to colour a number in classes along a colour ramp: Equal intervals makes every class as wide as the next, Equal counts puts about as many features in each. Pick 3 to 9 classes and a ramp; the class bounds are worked out for you and can be typed over.
Only the colour changes: sizes and widths stay as you set them.
What a viewer sees
The map full screen, with zoom, a basemap switcher and the list of layers, which is also the legend: each layer drawn in its own style, and a layer coloured by a field lists each value or class with its colour. Clicking a feature shows its fields.
What this does not do
Styling is how the map looks, not who can read the data. A hidden value or a filter changes what is drawn; anybody the WFS is shared with can still read every feature. To keep features or fields from people, publish a WFS without them.
Zoomed out, a map simplifies shapes and may leave the smallest out, and says so; zoomed in, every feature shows at full detail.