what are the storage size affected by.

[Elmothana2]

important note,

whan you pin more than one visuals, each belongs to defferent data set,your storage will count all data sets sizes that the visuals built on its data.

[v-easonf-msft · Accepted solution]

Hi,  @Elmothana2 

Included in your data storage are your own datasets and Excel reports, and those items that someone has shared with you. Datasets are any of the data sources you’ve uploaded or connected to. These data sources include Power BI Desktop files and Excel workbooks you’re using. The following are also included in your data capacity.

• Excel ranges pinned to a dashboard.
• Reporting Services on-premises visualizations pinned to a Power BI dashboard.
• Uploaded images.

The size of a dashboard that you share varies, depending on what's pinned to it. For example, if you pin items from two reports that are part of two different datasets, the size includes both datasets.

For more details,please refer to this document.

Best Regards,
Community Support Team _ Eason
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[lbendlin]

Dashboards do not have a storage cost at all. Are you concerned about memory cost?

[Elmothana2]

I think the refrence that com in @v-easonf-msft  's replay, would would give more details.

Many thanks @lbendlin