I searched in the BillWilliams.mqh for the Fractals indicator and I found some fragments of it. But this kind of coding (with classes etc.) is way beyond my knowledge.
Can somebody tell me where I could change the original arrow-wingding to a symbol of my choice? These arrows are too disturbing for me and I want to use a dot instead.
In MT4 you can't. If you want different arrows you need an alternative from Code Base, but the platform has a limitation and can't offset the arrows away from price (you'd need other buffers, recalculation on every timeframe etc. etc.). In MT5 it's all fixed and the code is available.
The mqh libraries are for internal use in other more complicated codes. They include only calculations of indicators, not plotting them on charts.
Attached is AsymetricFractals indicator I modified from the code base.
+ 6 * gChartScale;
- 8 * gChartScale;