Explanation
Click, Manage Packages
In the Manage Packages window, click Save
Search and Install the desired package
Click, All Packages
The correct sequence of steps to install a new Activities package in UiPath Studio 2021 10 is:
Click Manage Packages in the ribbon.
In the Manage Packages window, click All Packages in the left panel.
Search for the desired package in the search box and select it from the list.
Click Install and then Save to complete the installation.
Comprehensive and Detailed Explanation: To install a new Activities package in UiPath Studio 2021 10, you need to follow these steps:
Click Manage Packages in the ribbon. This will open the Manage Packages window, where you can browse, install, update, or remove packages from your project.
In the Manage Packages window, click All Packages in the left panel. This will display all the available packages from the official UiPath feed, as well as any other feeds that you have configured in the Settings tab.
Search for the desired package in the search box and select it from the list. You can also filter the packages by category, compatibility, or source. You can see the package details, such as version, description, dependencies, and release notes, in the right panel.
Click Install and then Save to complete the installation. The package will be added to your project dependencies and downloaded to the local cache. You can also choose to install a specific version of the package by clicking on the version number and selecting from the drop-down list.
References:
Managing Packages
Installing and Updating Packages

Explanation
The developer can use the Anchor functionality to improve the reliability of the Type Into activity for text input fields that are impacted by changing orientations. This is because the Anchor functionality allows the developer to specify a particular element as a reference point for the Type Into activity. This ensures that the activity will always be performed in the correct location, even if the orientation of the text input fields changes.
References:
Type Into - UiPath Activities
Anchor Base - UiPath Activities
UiPath Anchor Base Tutorial & AnchorPosition Example

Explanation
If the activity cannot find its target at runtime, an exception is thrown after 10 seconds. This is because the
"ContinueOnError" property is set to "False" and the "DelayAfter" property is set to "10" seconds. The
"ContinueOnError" property determines whether the automation should continue even when the activity fails, and the "DelayAfter" property specifies the amount of time (in milliseconds) to wait before moving to the next activity. (UiPath Automation Developer study guide) References:
Click
Common Properties

Explanation
The Where method is used to filter data in a List or Data Table based on a condition. It returns a new collection that contains only the elements that satisfy the condition12. The other methods are used for different purposes: OrderBy for sorting, GroupBy for grouping, and Select for projecting3.
References:
Linq query to filter datatable forum post, Answer by @ppr
How to use LINQ on a DataTable in Uipath forum post, Answer by @Dave
How to use LINQ [Basic to Advanced] in UiPath event description, Introduction section

Explanation
The Add Log Fields activity adds custom log fields to the Robot Execution Logs for every Log Message execution throughout the entire workflow1. The custom log fields will persist until a Remove Log Fields activity is used to remove them2. The other options are not correct.
References:
Add Log Fields documentation, Description section
Add log field forum post, Answer by @vvaidya