The "Other" category is the only category that cannot be deleted, but you can rename it to anything you like. This category is used for transactions that aren’t automatically categorized based on the initial data we get from the data aggregator (for example, Plaid) or don’t have an existing transaction name rule.
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If you do not want to allocate monthly spend to the "Other" category, then you can set the budget to $0.

We do not support categorizing internal transfer transactions. If you’d like to categorize this transaction, you will need to change the transaction type to ‘Regular.’ Internal transfers don’t count toward your monthly spend. However, you can use the Tags feature to track these transactions.

We don’t support income categories at this time, but you can use the tag feature to keep track of your different types of income.

The category bar will appear ‘unfilled’ if there's expected spending from an unpaid Recurring. A solid bar means the money has already been spent.
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This is because the category is set to have the 'same budget for all months' and the budget for the category has been set to $0. Since there is technically no budget for this category, it does not show a spending/budget bar, as there is no budget to compare the spending to.