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To add two sheets to the dashboard that support the Show/Hide button, you can add them to either a horizontal or a vertical container. A container is an object that can hold one or more sheets or other objects and allow you to arrange them in a layout. A Show/Hide button is a feature that lets you hide or show a container and its contents on the dashboard. You can add a Show/Hide button to any container, whether it is tiled or floating, by using the drop-down menu of the container and selecting "Add Show/Hide Button." You can also customize the appearance and behavior of the button.
To add a horizontal or a vertical container to the dashboard, you can drag them from the Objects pane to the dashboard. A horizontal container will arrange the sheets or objects horizontally, while a vertical container will arrange them vertically. You can then drag the sheets you want to add from the Sheets pane to the container. You can resize and reorder the sheets or objects within the container by using the handles and arrows.
The other objects in the Answer Area, such as text, image, web page, blank, navigation, download, and extension, do not support the Show/Hide button. They are either static elements that cannot hold other objects, or dynamic elements that require user interaction or external sources. You can add them to the dashboard as well, but they will not have the same functionality as a container with a Show/Hide button.
References:
Add Show/Hide Buttons - Tableau
Layout Containers - Tableau

check the steps below in explanation
Explanation:
To modify the chart to show only min and max values of both measures in each region, you need to do the following steps:
Open the link to Book1 found on the desktop. This will open the Tableau workbook that contains the Line worksheet.
Click on the Line tab at the bottom of the workbook to open the worksheet. You will see a line chart that shows the sales and profit for each month by region.
Drag Month from the Columns shelf to Filters shelf. This will open a dialog box that allows you to filter by different criteria.
Select Range of Dates from the dialog box. This will show you options to filter by a range of dates or values.
Select Minimum and Maximum from the drop-down list next to Month. This will filter by the minimum and maximum values of Month for each region. You can also enter specific values or use the sliders to adjust the range.
Click OK to apply the filter. You will see that the line chart now shows only min and max values of both measures in each region.

check the steps below in explanation.
Explanation:
To replace the existing data source with the Netflix_2019 data source, you need to do the following steps:
* Open the link to Book1 found on the desktop. This will open the Tableau workbook that contains the Movie Durations worksheet.
* Click on the Movie Durations tab at the bottom of the workbook to open the worksheet. You will see a bar chart that shows the number of movies by duration for the existing data source.
* Go to the Data Source tab at the bottom of the workbook to see the data source page. You will see a table that shows the fields and values from the existing data source.
* Click on the drop-down arrow next to the data source name at the top of the page and select Replace Data Source from the menu. This will open a dialog box that allows you to replace your data source with another one.
* Select Netflix_2019 from the list of available data sources and click OK. This will replace your existing data source with the Netflix_2019 data source and update your worksheet accordingly. You may need to fix any broken fields or calculations that result from the replacement.
References: https://help.tableau.com/current/pro/desktop/en-us/datasource_replace.htm https://help.tableau.
com/current/pro/desktop/en-us/datasource_replace_workbook.htm