The DotNet Tool Restore action in Continua CI is a wrapper around the .NET command line tools. If you're having trouble using the DotNet Tool Restore action, please refer to the .NET CLI documentation.
The DotNet Tool Restore action is used to restore .NET tools according to a manifest file.

A friendly name for this action (will be displayed in the actions workflow area).
Determines if this action will be run within the relevant stage.
Optional working folder for running the executable. Defaults to the workspace folder.
The Using drop down is populated with any property collector whose namespace matches the pattern defined by the DotNet CLI actions. The pattern for this action is ^NetCore\.App(?:\.|$) and is restricted to .NET 3.0 or later.
If you create a property collector for this action, make sure you select the Path Finder PlugIn type and give it a name that will match the pattern above. Example names listed here, search the table's Plugin column for "DotNet Tool Restore".
For more in-depth explanations on property collectors see Property Collectors.
Alternatively, you can select the Custom option from the Using drop down list and specify a path in the resulting input field that will be displayed. Please read Why it's a good idea to use a property collector before using this option.
The bitness of the DotNet executable. Options are Default, 32 Bit (X86), or 64 Bit (X64).
The SDK version to set in global.json file before running the DotNet executable.
A custom SDK version string. This field is only visible when the SDK Version is set to 'Custom'.

The NuGet configuration file (nuget.config) to use for the restore operation. [--configfile]
One or more additional NuGet package sources to use during the restore operation. [--add-source]
Path to the tool manifest file that specifies which .NET local tools and their versions to restore. The manifest file is typically named dotnet-tools.json and located in a .config subfolder. If left blank, the dotnet executable searches for the manifest in the working folder and .config subfolder. [--tool-manifest]

If this is ticked, multiple restore operations are run concurrently. Untick to disable parallel restoring. [--disable-parallel]
When this is ticked, package source failures are treated as warnings rather than errors. The restore will still succeed if the required packages can be found from other configured sources. This is useful when a secondary package source may be temporarily unavailable. [--ignore-failed-sources]
If this is ticked, packages and http requests are cached. Untick to disable caching. [--no-cache]

If this is ticked, the command line output is written to the build log.
The amount of information detail to display in the build log. Only visible when Log standard output is enabled. [--verbosity]
How long to wait for the action to finish running before timing out. Leaving this blank (or zero) will default to 86400 seconds (24 hours).
Tick to continue build on failure marking the action with a warning status.
If this is ticked, any warnings logged will not mark the action with a warning status.

Multiple environment variables can be defined - one per line. These are set before the command line is run.
If this is ticked, environment variable values are written to the build log.
Tick this checkbox to set up a list of new environment variables prefixed with 'ContinuaCI.' for all current system expression objects and variables.
This checkbox is visible only if the 'Generate system environment variables' checkbox is ticked.
If this is ticked, the values of any variables marked as sensitive will be masked with **** when setting system environment variables. Clear this to expose the values.