The steps to make customizable queries towards views in Power BI reusable are as follows:
Firstly, a query is created by going to Transform Data > Advanced Editor on the Power BI desktop. For them to work, all codes should be written in M codes.
The next step is to save the query as a view. To do this, name the view in a way that makes it easy to identify its purpose.
If other reports or dashboards require the same query, it can be identified and modified so that duplicates no longer exist. Furthermore, query references can also be utilized.
More attention needs to be paid here as performance issues arise. Staging tables and incremental loading may be required to manage large datasets, while complex queries should be avoided as they massively slow down the dashboard's performance.
After the query is published, further performance issues can be avoided by regularly updating the dataset without compromising the quality of the dashboard.
In conclusion, these steps ensure that the custom query will not impact the dashboard's performance.