# Vizpads FAQs

#### **What is the limit on the number of charts I can add to a vizpad and within one tab?**

A Vizpad can have 10 tabs, and each tab can have upto 25 charts.

#### **Does the row-level data security apply to Search and Vizpads?**

Yes, it does. However, it needs to be set up by the admin. Row-level policy is defined for a group over a Business View so that when users search and run analysis on datasets, they only see the data associated with them (and not the data that is private to a different user).

#### **Can selection on one chart act as a filter on another?**

Yes, it can be done by selecting **Keep** or **Drill-in** after clicking on a slice of a chart.

#### **The calculated columns that are displayed during data preparation does not show up when I’m editing a Vizpad. How do I make them visible?**

Go to the required **Business View** and select **Edit**. Add all columns or check the columns you need to pick.

#### **Is there a way to rename the tabs?**

Yes, click on the dropdown in a tab and select **Rename**.

#### **Can I build a Vizpad using multiple Business Views?**

Yes, check out our [multi-Business View Vizpads](https://help.tellius.com/vizpads-explore/creating-vizpads#multi-business-view-vizpads).

#### **Can I develop my own custom visualizations via rest-based APIs?**

Tellius offers two forms of embedding:

* Embedding Tellius modules (UI) into external applications (via Embedding URLs)
* External applications querying and getting results/output via APIs


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